fix: improve merge token logic to account for nested dicts

[darrelhong]

Description

This PR fixes #3806 as it appears the the tokens object may contain nested objects. Added a function to handle merging nested dicts

All Promptflow Contribution checklist:

• [x] The pull request does not introduce [breaking changes].
• [ ] CHANGELOG is updated for new features, bug fixes or other significant changes.
• [x] I have read the contribution guidelines.
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Testing Guidelines

• [ ] Pull request includes test coverage for the included changes.

[darrelhong]

@microsoft-github-policy-service agree

[chanedwin]

this might solve issues - https://github.com/microsoft/promptflow/issues/3834 and https://github.com/microsoft/promptflow/issues/3806 facing this issue as well

2024-11-03 21:55:24 +0800   30919 execution          ERROR    1/1 flow run failed, indexes: [0], exception of index 0: Execution failure in 'generate_creative_rewrites': (TypeError) unsupported operand type(s) for +: 'dict' and 'dict'

using promptflow==1.16.1 and openai ==1.44.1

[github-actions[bot]]

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[github-actions[bot]]

SDK CLI Global Config Test Result fix/merge-tokens

0 tests   0 ✅  0s ⏱️ 0 suites  0 💤 0 files    0 ❌

Results for commit 8727276e.

[github-actions[bot]]

Executor E2E Test Result fix/merge-tokens

0 tests   0 ✅  0s ⏱️ 0 suites  0 💤 0 files    0 ❌

Results for commit 8727276e.

[github-actions[bot]]

Executor Unit Test Result fix/merge-tokens

0 tests   0 ✅  0s ⏱️ 0 suites  0 💤 0 files    0 ❌

Results for commit 8727276e.