[API Compatibility No.23] Add unsqueeze_ dim/axis API compat -part

[xunyoyo]

PR Category

User Experience

PR Types

New features

Description

• Add C++ alias mapping for paddle.Tensor.unsqueeze_ to accept dim as axis.
• Keep paddle.unsqueeze_ Python wrapper with param alias for backward compatibility.
• Add doc signature for unsqueeze_.
• Add API compatibility test for inplace unsqueeze.

[paddle-bot]

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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
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Additional details and impacted files

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[xunyoyo]

/re-run all-failed