Add release-notes SOP for generating release notes

[zastrowm]

Description

Add an agent to generate more detailed release notes for a given release. This is applicable to both Python & TypeScript though all of the tests/examples that I ran were for Python (since they have more interesting stuff right now)

Flow:

• Create an issue for release notes to be created for, mentioning the tags/branches you want it for. Or point it at a GitHub release
• Agent will confirm with you which items are worth calling out in the two sections (features and major bug fixes)
• Agent will then generate release notes with code samples (that are verified via tests). Agent will post the release notes to the issue

The SOP script was modified to:

• Include the "release notes" & "release-notes" command
• Allow additional text to be included after the command (so that you can trigger the agents with a comment and explaining text)

Examples:

• Release notes for v 1.20.0 of the sdk-python zastrowm/sdk-typescript#31
• Release notes for v 1.17.0 of the sdk-python zastrowm/sdk-typescript#30
• Release notes for v 1.18.0 of the sdk-python zastrowm/sdk-typescript#29

Type of Change

New feature

Testing

How have you tested the change?

• I ran npm run check

Checklist

• I have read the CONTRIBUTING document
• I have added any necessary tests that prove my fix is effective or my feature works
• I have updated the documentation accordingly
• I have added an appropriate example to the documentation to outline the feature, or no new docs are needed
• My changes generate no new warnings
• Any dependent changes have been merged and published

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