[ CLI ] Rename CLI binaries in @php-wasm/cli and @wp-playground/cli (#2441)

## Motivation for the change, related issues

Currently, when NPM installs `@php-wasm/cli`, it creates a binary named
`cli` in the `node_modules/.bin`. However, if there is an already
existing `cli` binary in the `node_modules/.bin` directory, the action
is ignored.

That is what is happening when trying to install both `@php-wasm/cli`
and `@wp-playground/cli` in the same project.

This pull request aims to rename these generic binaries into : 

- `cli` > `php-wasm-cli`
- `cli` > `wp-playground-cli`

## Implementation details

`@php-wasm/cli/package.json`
```diff
- "bin": "php-wasm.js"
+ "bin": {
+	"php-wasm-cli": "php-wasm.js"
+ },
```

`@wp-playground-cli/package.json`
```diff
- "bin": "wp-playground.js"
+ "bin": {
+	"wp-playground-cli": "wp-playground.js"
+ },
```

## Testing Instructions (or ideally a Blueprint)

Run `npm install` in a empty directory : 

```
npm install @php-wasm/cli @wp-playground/cli
```

### Before

```
> ls -1A node_modules/.bin

cli
crc32
mime
semver
sha.js
xdebug-bridge
```

### After

```
> ls -1A node_modules/.bin

crc32
mime
php-wasm-cli
semver
sha.js
wp-playground-cli
xdebug-bridge
```

Author: mho22

packages/php-wasm/cli/package.json

@@ -22,6 +22,8 @@
 	"license": "GPL-2.0-or-later",
 	"type": "module",
 	"main": "main.js",
-	"bin": "php-wasm.js",
+	"bin": {
+		"php-wasm-cli": "php-wasm.js"
+	},
 	"gitHead": "2f8d8f3cea548fbd75111e8659a92f601cddc593"
 }

packages/playground/cli/package.json

@@ -31,6 +31,8 @@
 	"main": "./index.cjs",
 	"module": "./index.js",
 	"types": "index.d.ts",
-	"bin": "wp-playground.js",
+	"bin": {
+		"wp-playground-cli": "wp-playground.js"
+	},
 	"gitHead": "2f8d8f3cea548fbd75111e8659a92f601cddc593"
 }