Modernize project structure

BREAKING CHANGE: The project now exports an ECMAScript module by
default, albeit with an UMD fallback, ships with types, the dist/
directory no longer exists in version control, and Closure Compiler
externs have been removed.

Author: dcodeIO

.github/FUNDING.yml

@@ -0,0 +1 @@
+github: dcodeIO

.github/workflows/publish.yml

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+name: Publish
+on:
+  workflow_dispatch:
+jobs:
+  publish:
+    name: Publish
+    if: github.repository == 'dcodeIO/bcrypt.js'
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v4
+      with:
+        ref: master
+    - uses: actions/setup-node@v4
+      with:
+        node-version: current
+    - name: Install dependencies
+      run: npm ci
+    - name: Build
+      run: npm run build
+    - name: Run tests
+      run: npm test
+    - name: Publish
+      env:
+        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        NPM_TOKEN: ${{ secrets.NPM_TOKEN }}
+      run: |
+        VERSION=$(npx aspublish --version)
+        if [ -z "$VERSION" ]; then
+          echo "Changes do not trigger a release"
+        else
+          echo "Publishing new version: $VERSION"
+          npx aspublish
+        fi