CI: Move repo to a Makefile

#### Problem

The feature-gate repo is still using package.json commands even though
Makefile commands are great.

#### Summary of changes

Similar to many other repos:

* remove test-sbf and bpf-entrypoint features
* update all scripts
* upgrade rust renderer to 1.0.22 to pass clippy
* fix spellcheck errors
* update ring for audit error
* update fuzz program name, add README with info

This repo also generates IDLs from the program implementation, so this
PR also adds a `generate-idl-%` recipe for generating the IDL given a
path, similar to other Rust packages.

Requires solana-program/actions#14 to land.

Author: joncinque

.github/actions/setup/action.yml

@@ -0,0 +1,9 @@
+
+- package-ecosystem: npm
+directory: "clients/js"
+schedule:
+  interval: daily
+  time: "09:00"
+  timezone: UTC
+open-pull-requests-limit: 6
+

.github/dependabot.yml

@@ -0,0 +1,22 @@
+name: Dependabot auto-merge
+on: pull_request
+
+permissions:
+  contents: write
+  pull-requests: write
+
+jobs:
+  dependabot:
+    runs-on: ubuntu-latest
+    if: github.event.pull_request.user.login == 'dependabot[bot]' && github.repository_owner == 'solana-program'
+    steps:
+      - name: Enable auto-merge
+        run: gh pr merge --auto --squash "$PR_URL"
+        env:
+          PR_URL: ${{ github.event.pull_request.html_url }}
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+      - name: Approve
+        run: gh pr review --approve "$PR_URL"
+        env:
+          PR_URL: ${{ github.event.pull_request.html_url }}
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}