ci: size diff (#201)

## 📜 Description

Added script for calculation `.pkg` difference between current changes
and changes in target branch.

## 💡 Motivation and Context

To keep a track on package size and to be sure that I don't write
changes which could significantly increase package size.

## 📢 Changelog

### CI
- added `size-diff.yml` file;
- send sticky message with a report about size changes;

## 🤔 How Has This Been Tested?

Tested on CI 🙂 

## 📸 Screenshots (if appropriate):

<img width="919" alt="image"
src="https://github.com/kirillzyusko/react-native-keyboard-controller/assets/22820318/70cd6237-fc4f-4c35-b8b8-f6aef4ffa00f">

## 📝 Checklist

- [x] CI successfully passed

.github/workflows/size-diff.yml

@@ -0,0 +1,51 @@
+name: 🧪 Size diff
+
+on:
+  pull_request:
+    paths:
+      - '.github/workflows/size-diff.yml'
+      - '!example/**'
+      - '!FabricExample/**'
+      - '!docs/**'
+      - '!scripts/**'
+
+jobs:
+  check-diff:
+    name: 🔬 Find npm package size diff
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout to target branch
+        uses: actions/checkout@v3
+        with:
+          ref: ${{ github.event.pull_request.base.ref }}
+      - name: Install dependencies
+        run: yarn install --frozen-lockfile
+      - name: Calculate size of package (target)
+        id: old-size
+        run: echo "OLD_SIZE=$(node scripts/size.js)" >> "$GITHUB_OUTPUT"
+      - uses: actions/checkout@v3
+      - name: Install dependencies
+        run: yarn install --frozen-lockfile
+      - name: Calculate size of package (current)
+        id: new-size
+        run: echo "NEW_SIZE=$(node scripts/size.js)" >> "$GITHUB_OUTPUT"
+      - name: Calculate difference
+        id: diff
+        env:
+          NEW_SIZE: ${{ steps.new-size.outputs.NEW_SIZE }}
+          OLD_SIZE: ${{ steps.old-size.outputs.OLD_SIZE }}
+        run: |
+          echo "DIFF=$((NEW_SIZE - OLD_SIZE))" >> "$GITHUB_OUTPUT"
+          echo "SIGN=$([ $((NEW_SIZE - OLD_SIZE)) -gt 0 ] && echo "📈" || echo "📉")" >> "$GITHUB_OUTPUT"
+      - uses: marocchino/sticky-pull-request-comment@v2
+        env:
+          NEW_SIZE: ${{ steps.new-size.outputs.NEW_SIZE }}
+          OLD_SIZE: ${{ steps.old-size.outputs.OLD_SIZE }}
+          DIFF: ${{ steps.diff.outputs.DIFF }}
+          SIGN: ${{ steps.diff.outputs.SIGN }}
+        with:
+          message: |
+            ### 📊 Package size report
+            | Current size  | Target Size   | Difference               |
+            | ------------- | ------------- | ------------------------ |
+            | ${{ env.NEW_SIZE }} bytes | ${{ env.OLD_SIZE }} bytes | ${{ env.DIFF }} bytes ${{ env.SIGN }} |