feat: Add Travel Request Approval Management App

[summitbaj]

• New canvas app for travel approvals
• Added solution components and assets
• Updated documentation and metadata

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Put an x in all the items that apply ([x], without spaces), make notes next to any that haven't been addressed.

• Bug fix?
• [ x] New sample?
• Related issues: fixes #X, partially #Y, mentioned in #Z
• Needs API permissions?
• Has other prerequisites? (E.g. requires a list, document library, etc.)

What's in this Pull Request?

✅ Added enterprise-grade travel request management solution.

Checklist

This checklist is mostly useful as a reminder of small things that can easily be forgotten – it is meant as a helpful tool rather than hoops to jump through.

Put an x in all the items that apply ([x], no spaces), make notes next to any that haven't been addressed.

• My pull request affects only ONE sample.
• I have updated the README file.
• My README has at least one static high-resolution screenshot (i.e. not a GIF)
• My README contains complete setup instructions, including pre-requisites and permissions required

Submitter Guidance (DELETE AFTER READING)

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Pull requests that do not follow this template will be automatically rejected.

Please target your PR to main branch.

[github-actions]

Validation failed!

File: samples/travel-request-approval/assets/sample.json

• Invalid url for thumbnail Timesheet Power App #1 property: The provided URL is not responding correctly!

[github-actions]

Validation failed!

File: samples/travel-request-approval/assets/sample.json

• Invalid url for thumbnail Timesheet Power App #1 property: The provided URL is not responding correctly!

[github-actions]

Validation failed!

File: samples/travel-request-approval/assets/sample.json

• Invalid url for thumbnail Timesheet Power App #1 property: The provided URL is not responding correctly!

[github-actions]

Validation failed!

File: samples/travel-request-approval/assets/sample.json

• Invalid url for thumbnail Timesheet Power App #1 property: The provided URL is not responding correctly!