ci: add GitHub Actions CI pipeline, issue templates, and dependabot updates

Author: sumant1122

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: 🐛 Bug report
+about: Create a report to help us improve RingLog
+title: '[BUG] <Short description of the bug>'
+labels: bug
+assignees: ''
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**Reproduction Steps**
+Steps to reproduce the behavior:
+1. Run server: `cargo run -- server`
+2. Run consumer / producer: `...`
+3. See error: `...`
+
+**Expected Behavior**
+A clear and concise description of what you expected to happen.
+
+**Environment (please complete the following information):**
+- Linux Kernel version (`uname -r`):
+- Rust toolchain version (`rustc --version`):
+- CPU architecture:
+
+**Additional Context**
+Add any other context, stack traces, console logs, or details about the issue here.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: 🚀 Feature request
+about: Suggest an idea or feature addition for RingLog
+title: '[FEAT] <Short description of the proposed feature>'
+labels: enhancement
+assignees: ''
+
+---
+
+**Is your feature request related to a problem? Please describe.**
+A clear and concise description of what the problem is. Ex. "I'm frustrated when..."
+
+**Describe the solution you'd like**
+A clear and concise description of what you want to happen.
+
+**Describe alternatives you've considered**
+A clear and concise description of any alternative solutions or features you've considered.
+
+**Additional Context**
+Add any other context, API design notes, or diagrams about the feature request here.

.github/dependabot.yml

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+version: 2
+updates:
+  - package-ecosystem: "cargo"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+    open-pull-requests-limit: 5
+    labels:
+      - "dependencies"
+      - "rust"

.github/workflows/ci.yml

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+name: CI
+
+on:
+  push:
+    branches: [ "master" ]
+  pull_request:
+    branches: [ "master" ]
+
+env:
+  CARGO_TERM_COLOR: always
+
+jobs:
+  build:
+    name: Build & Test
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Checkout Source Code
+      uses: actions/checkout@v4
+    
+    - name: Set up Rust Toolchain
+      uses: dtolnay/rust-toolchain@stable
+      with:
+        components: rustfmt, clippy
+
+    - name: Cache Cargo Dependencies
+      uses: Swatinem/rust-cache@v2
+
+    - name: Check Code Formatting
+      run: cargo fmt --all --check
+
+    - name: Run Clippy Linter
+      run: cargo clippy -- -D warnings
+
+    - name: Build Codebase
+      run: cargo build --verbose