chore: add PR templates

to standardize PR documentation

Author: Ang-dot

.github/PULL_REQUEST_TEMPLATE.md

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+Click the `Preview` tab and select a PR template:
+
+- [Default Template](?expand=1&template=default.md)
+- [Plugin](?expand=1&template=plugin.md)

.github/PULL_REQUEST_TEMPLATE/default.md

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+# Summary
+
+One-liner - what does this change?
+
+## Links
+
+- Jira/Notion:
+- Issue link:
+- Other useful links:
+
+## Changes
+
+(Answer where applicable)
+
+- Why this PR is needed?
+- What does this add?
+- What does this deprecate?
+- What does this improve?
+
+## Related Changes
+
+- Does this have a dependant PR? Eg. link to original PR if this is a bug fix PR.
+
+(Use table to list all related PRs if done in parts)
+
+| Description | PR |
+| --- | --- |
+| [Part 1] This PR | ⬅️ |
+| [Part 2] Another PR | link |
+| [Part 3] Another PR | link |
+
+## Dev Testing
+
+(Include where applicable)
+
+- Screenshots
+- Video Recordings
+
+## Pre-release Checklist
+
+- [ ] QA/PM's approval
+- [ ] (If files are removed) Check all usages of the deleted files
+
+## Rollback Steps
+
+- Any steps to follow in the event of rollback due to breaking release. Eg. toggle feature flag, revert commit etc.

.github/PULL_REQUEST_TEMPLATE/plugin.md

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+# Summary
+
+One-liner – What does this plugin contribution add or change?
+
+## Links
+
+- Plugin documentation:
+- Issue link (if applicable):
+- Other useful links:
+
+## Description
+
+(Answer where applicable)
+
+- Why is this plugin contribution needed?
+- What functionality does this plugin add or enhance?
+- What dependencies or integrations does it introduce?
+
+## Plugin Details
+
+- Plugin Name:
+- Compatibility Notes (if applicable):
+- Additional Setup Instructions (if required):
+
+## Plugin Documentation Checklist
+
+- README Validation
+    - [ ] Clear installation instructions
+    - [ ] Usage examples with code snippets
+    - [ ] List of features and capabilities
+    - [ ] Troubleshooting guide (if applicable)
+    - [ ] Contribution guidelines (if applicable)
+
+- Metadata Validation
+    - [ ] Complete metadata provided in reference to [plugin metadata template](../.././plugins/plugin_metadata_template.yml)
+
+## Dev Testing
+
+(Include where applicable)
+
+- Screenshots/GIFs
+- Video Demonstrations
+- Logs or Console Outputs
+- Testing steps for the plugin
+
+## Additional Notes
+
+- Any considerations for future updates or enhancements.
+- Known issues or limitations with this plugin contribution.