Added CodeOwners, PRTemplate and StaleBot

Author: Prasanjeet-Microsoft

.github/CODEOWNERS

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+# Lines starting with '#' are comments.
+# Each line is a file pattern followed by one or more owners.
+
+# These owners will be the default owners for everything in the repo.
+* @Avijit-Microsoft @Roopan-Microsoft @Prajwal-Microsoft

.github/PULL_REQUEST_TEMPLATE.md

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+## Purpose
+<!-- Describe the intention of the changes being proposed. What problem does it solve or functionality does it add? -->
+* ...
+
+## Does this introduce a breaking change?
+<!-- Mark one with an "x". -->
+
+- [ ] Yes
+- [ ] No
+
+<!-- Please prefix your PR title with one of the following:
+  * `feat`: A new feature
+  * `fix`: A bug fix
+  * `docs`: Documentation only changes
+  * `style`: Changes that do not affect the meaning of the code (white-space, formatting, missing semi-colons, etc)
+  * `refactor`: A code change that neither fixes a bug nor adds a feature
+  * `perf`: A code change that improves performance
+  * `test`: Adding missing tests or correcting existing tests
+  * `build`: Changes that affect the build system or external dependencies (example scopes: gulp, broccoli, npm)
+  * `ci`: Changes to our CI configuration files and scripts (example scopes: Travis, Circle, BrowserStack, SauceLabs)
+  * `chore`: Other changes that don't modify src or test files
+  * `revert`: Reverts a previous commit
+  * !: A breaking change is indicated with a `!` after the listed prefixes above, e.g. `feat!`, `fix!`, `refactor!`, etc.
+-->
+
+## Golden Path Validation
+- [ ] I have tested the primary workflows (the "golden path") to ensure they function correctly without errors.
+
+## Deployment Validation
+- [ ] I have validated the deployment process successfully and all services are running as expected with this change.
+
+## What to Check
+Verify that the following are valid
+* ...
+
+## Other Information
+<!-- Add any other helpful information that may be needed here. -->

.github/workflows/stale-bot.yml

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+name: 'Close stale issues and PRs'
+on:
+  schedule:
+    - cron: '30 1 * * *'
+
+permissions:
+  contents: write
+  issues: write
+  pull-requests: write
+
+jobs:
+  stale:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/stale@v9
+        with:
+          stale-issue-message: 'This issue is stale because it has been open 180 days with no activity. Remove stale label or comment or this will be closed in 30 days.'
+          days-before-stale: 180
+          days-before-close: 30