[Feature] Support default input index when collect package tools for custom-llm tool

[chenslucky]

Description

Reason

Previously, customers complained that the order of custom-llm tool inputs displayed in the UI was inconsistent with the order defined in tool interface or yaml file. This was because the UI received the inputs as a dict, which resulted in an alphabetical order display.
In this PR, we will automatically add "ui_hints": {"index": XX} to every input based on the order in tool interface or yaml file for custom_llm tool. When UI received tool inputs, they can display the inputs according to this ui_hints["index"] field to make the order consistent. Both portal and extension have completed the code change to support ui_hints["index"].

Cases which will not be corrected by this pr:

• Existing flow with flow.tools.json
• All examples in promptflow gallery which also have flow.tools.json file

Test

For more test cases, please go to this link

• custom-llm tool
  

  • in portal
    
  • in extension
    

• built in custom-llm tool

  • in portal:
    
  • in extension:
    

• Test cases
  The behavior of the following test cases are as expected. Only custom_llm tool's inputs' order are corrected, other tool's inputs' order keep same as before.

  • Create a new flow
  • Clone a flow
  • Upload a flow without .promptflow folder

All Promptflow Contribution checklist:

• The pull request does not introduce [breaking changes].
• CHANGELOG is updated for new features, bug fixes or other significant changes.
• I have read the contribution guidelines.
• Create an issue and link to the pull request to get dedicated review from promptflow team. Learn more: suggested workflow.

General Guidelines and Best Practices

• Title of the pull request is clear and informative.
• There are a small number of commits, each of which have an informative message. This means that previously merged commits do not appear in the history of the PR. For more information on cleaning up the commits in your PR, see this page.

Testing Guidelines

• Pull request includes test coverage for the included changes.

[github-actions]

SDK CLI Global Config Test Result chesi/support-input-index

2 tests   2 ✅  45s ⏱️
1 suites  0 💤
1 files    0 ❌

Results for commit af9a1b7.

♻️ This comment has been updated with latest results.

[github-actions]

Executor Unit Test Result chesi/support-input-index

702 tests   702 ✅  41s ⏱️
  1 suites    0 💤
  1 files      0 ❌

Results for commit af9a1b7.

♻️ This comment has been updated with latest results.

[github-actions]

promptflow SDK CLI Azure E2E Test Result chesi/support-input-index

  4 files    4 suites   3m 14s ⏱️
128 tests 109 ✅ 19 💤 0 ❌
512 runs  436 ✅ 76 💤 0 ❌

Results for commit af9a1b7.

♻️ This comment has been updated with latest results.

[github-actions]

Executor E2E Test Result chesi/support-input-index

188 tests   185 ✅  3m 55s ⏱️
  1 suites    3 💤
  1 files      0 ❌

Results for commit af9a1b7.

♻️ This comment has been updated with latest results.

[github-actions]

SDK CLI Test Result chesi/support-input-index

   12 files     12 suites   37m 42s ⏱️
  416 tests   408 ✅  8 💤 0 ❌
1 664 runs  1 632 ✅ 32 💤 0 ❌

Results for commit af9a1b7.

♻️ This comment has been updated with latest results.