fix [NET-1407]: add missing .npmignore files so that protobuf files are included in NPM packaging (#2986)

## Summary

In the absence of the _.npmignore_ file the _.gitignore_ file will be
used instead by NPM to exclude files from packaging. This caused an
issue for us in some packages as generated protobuf descriptions were
not included.

Example error  
```
2025-01-22T14:26:44: Error: Cannot find module '../../generated/packages/dht/protos/DhtRpc'
2025-01-22T14:26:44: Require stack:
2025-01-22T14:26:44: - /root/.nvm/versions/node/v20.15.0/lib/node_modules/@streamr/node/node_modules/@streamr/dht/dist/src/connection/ConnectionManager.js
2025-01-22T14:26:44: - /root/.nvm/versions/node/v20.15.0/lib/node_modules/@streamr/node/node_modules/@streamr/dht/dist/src/dht/DhtNode.js
2025-01-22T14:26:44: - /root/.nvm/versions/node/v20.15.0/lib/node_modules/@streamr/node/node_modules/@streamr/dht/dist/src/exports.js
2025-01-22T14:26:44: - /root/.nvm/versions/node/v20.15.0/lib/node_modules/@streamr/node/node_modules/@streamr/trackerless-network/dist/src/logic/ExternalNetworkRpc.js
2025-01-22T14:26:44: - /root/.nvm/versions/node/v20.15.0/lib/node_modules/@streamr/node/node_modules/@streamr/trackerless-network/dist/src/NetworkNode.js
2025-01-22T14:26:44: - /root/.nvm/versions/node/v20.15.0/lib/node_modules/@streamr/node/node_modules/@streamr/trackerless-network/dist/src/exports.js
2025-01-22T14:26:44: - /root/.nvm/versions/node/v20.15.0/lib/node_modules/@streamr/node/node_modules/@streamr/sdk/src/NetworkNodeFacade.js
2025-01-22T14:26:44: - /root/.nvm/versions/node/v20.15.0/lib/node_modules/@streamr/node/node_modules/@streamr/sdk/src/publish/Publisher.js
2025-01-22T14:26:44: - /root/.nvm/versions/node/v20.15.0/lib/node_modules/@streamr/node/node_modules/@streamr/sdk/src/StreamrClient.js
2025-01-22T14:26:44: - /root/.nvm/versions/node/v20.15.0/lib/node_modules/@streamr/node/node_modules/@streamr/sdk/src/exports.js
2025-01-22T14:26:44: - /root/.nvm/versions/node/v20.15.0/lib/node_modules/@streamr/node/node_modules/@streamr/sdk/src/exports-commonjs.js
2025-01-22T14:26:44: - /root/.nvm/versions/node/v20.15.0/lib/node_modules/@streamr/node/dist/src/broker.js
2025-01-22T14:26:44: - /root/.nvm/versions/node/v20.15.0/lib/node_modules/@streamr/node/dist/bin/streamr-node.js
2025-01-22T14:26:44:     at Module._resolveFilename (node:internal/modules/cjs/loader:1145:15)
2025-01-22T14:26:44:     at Hook._require.Module.require (/root/.nvm/versions/node/v20.15.0/lib/node_modules/pm2/node_modules/require-in-the-middle/index.js:81:25)
2025-01-22T14:26:44:     at require (node:internal/modules/helpers:179:18)
2025-01-22T14:26:44:     at Object.<anonymous> (/root/.nvm/versions/node/v20.15.0/lib/node_modules/@streamr/node/node_modules/@streamr/dht/dist/src/connection/ConnectionManager.js:42:18)
2025-01-22T14:26:44:     at Module._compile (node:internal/modules/cjs/loader:1358:14)
2025-01-22T14:26:44:     at Module._extensions..js (node:internal/modules/cjs/loader:1416:10)
2025-01-22T14:26:44:     at Module.load (node:internal/modules/cjs/loader:1208:32)
2025-01-22T14:26:44:     at Module._load (node:internal/modules/cjs/loader:1024:12)
2025-01-22T14:26:44:     at Module.require (node:internal/modules/cjs/loader:1233:19)
2025-01-22T14:26:44:     at Hook._require.Module.require (/root/.nvm/versions/node/v20.15.0/lib/node_modules/pm2/node_modules/require-in-the-middle/index.js:101:39) {
2025-01-22T14:26:44:   code: 'MODULE_NOT_FOUND',
2025-01-22T14:26:44:   requireStack: [
2025-01-22T14:26:44:     '/root/.nvm/versions/node/v20.15.0/lib/node_modules/@streamr/node/node_modules/@streamr/dht/dist/src/connection/ConnectionManager.js',
2025-01-22T14:26:44:     '/root/.nvm/versions/node/v20.15.0/lib/node_modules/@streamr/node/node_modules/@streamr/dht/dist/src/dht/DhtNode.js',
2025-01-22T14:26:44:     '/root/.nvm/versions/node/v20.15.0/lib/node_modules/@streamr/node/node_modules/@streamr/dht/dist/src/exports.js',
2025-01-22T14:26:44:     '/root/.nvm/versions/node/v20.15.0/lib/node_modules/@streamr/node/node_modules/@streamr/trackerless-network/dist/src/logic/ExternalNetworkRpc.js',
2025-01-22T14:26:44:     '/root/.nvm/versions/node/v20.15.0/lib/node_modules/@streamr/node/node_modules/@streamr/trackerless-network/dist/src/NetworkNode.js',
2025-01-22T14:26:44:     '/root/.nvm/versions/node/v20.15.0/lib/node_modules/@streamr/node/node_modules/@streamr/trackerless-network/dist/src/exports.js',
2025-01-22T14:26:44:     '/root/.nvm/versions/node/v20.15.0/lib/node_modules/@streamr/node/node_modules/@streamr/sdk/src/NetworkNodeFacade.js',
2025-01-22T14:26:44:     '/root/.nvm/versions/node/v20.15.0/lib/node_modules/@streamr/node/node_modules/@streamr/sdk/src/publish/Publisher.js',
2025-01-22T14:26:44:     '/root/.nvm/versions/node/v20.15.0/lib/node_modules/@streamr/node/node_modules/@streamr/sdk/src/StreamrClient.js',
2025-01-22T14:26:44:     '/root/.nvm/versions/node/v20.15.0/lib/node_modules/@streamr/node/node_modules/@streamr/sdk/src/exports.js',
2025-01-22T14:26:44:     '/root/.nvm/versions/node/v20.15.0/lib/node_modules/@streamr/node/node_modules/@streamr/sdk/src/exports-commonjs.js',
2025-01-22T14:26:44:     '/root/.nvm/versions/node/v20.15.0/lib/node_modules/@streamr/node/dist/src/broker.js',
2025-01-22T14:26:44:     '/root/.nvm/versions/node/v20.15.0/lib/node_modules/@streamr/node/dist/bin/streamr-node.js'
2025-01-22T14:26:44:   ]
2025-01-22T14:26:44: }
```

## Future improvements
- The _.npmignore_ files could be harmonized across sub-packages.

Author: Eric Andrews

packages/autocertifier-client/.npmignore

@@ -0,0 +1,10 @@
+.idea
+/src
+/test
+/generated
+jest.config.js
+tsconfig.json
+tsconfig.*.json
+*.tsbuildinfo
+.eslintignore
+.eslintrc

packages/dht/.npmignore

@@ -0,0 +1,10 @@
+.idea
+/src
+/test
+/generated
+jest.config.js
+tsconfig.json
+tsconfig.*.json
+*.tsbuildinfo
+.eslintignore
+.eslintrc

packages/proto-rpc/.npmignore

@@ -0,0 +1,11 @@
+.idea
+/src
+/test
+/generated
+/examples
+jest.config.js
+tsconfig.json
+tsconfig.*.json
+*.tsbuildinfo
+.eslintignore
+.eslintrc

packages/trackerless-network/.npmignore

@@ -0,0 +1,10 @@
+.idea
+/src
+/test
+/generated
+jest.config.js
+tsconfig.json
+tsconfig.*.json
+*.tsbuildinfo
+.eslintignore
+.eslintrc