[BugFix] Add TensorDictModuleBase repr

[priba]

Description

Moves __repr__ to TensorDictModuleBase so subclasses provide an informative representation of their child modules, input keys, and output keys. The representation does not report a device because a module may contain state on multiple devices.

Follow-up

#1770 deprecates the existing TensorDictModule.device property for removal in TensorDict 0.17. It was developed as a direct stack on this PR and rebased onto main after this PR merged.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds core functionality)
• Breaking change (fix or feature which changes existing functionality)
• Documentation

Checklist

• I have read the contribution guide.
• I have updated the tests accordingly.
• My change requires documentation updates.

[github-actions]

PR Title Label Error

PR title must start with a label prefix in brackets (e.g., [BugFix]).

Current title: Add TensorDictModuleBase repr and device

Supported Prefixes

Your PR title must start with exactly one of these prefixes (case-insensitive):

Prefix	Label Applied	Example
[BE]	BE	[BE] Improve internal plumbing
[BugFix] or [Fix]	bug	[BugFix] Fix memory leak in TensorDict
[Feature]	Feature	[Feature] Add new storage backend
[Doc] or [Docs]	documentation	[Doc] Update installation guide
[Refactor]	Refactor	[Refactor] Clean up module imports
[CI]	CI	[CI] Fix workflow permissions
[Test] or [Tests]	Test	[Test] Add unit tests for nn module
[Compile]	Compile	[Compile] Fix torch.compile issue
[Performance] or [Perf]	Performance	[Perf] Optimize tensor operations
[Deprecation]	Deprecation	[Deprecation] Mark old function
[Setup]	setup	[Setup] Update build configuration
[Distributed], [Dist], or [DTensor]	Distributed	[DTensor] Add cross-mesh transfer
[Benchmark] or [Bench]	Benchmarks	[Benchmark] Add compile benchmark
[Typing] or [Type]	Typing	[Typing] Add type stubs
[BC-breaking] or [BC]	BC-breaking	[BC-breaking] Remove deprecated API
[Formatting] or [Format]	Formatting	[Format] Fix code style
[Quality]	Quality	[Quality] Improve error messages
[Release]	release	[Release] Publish release artifacts
[Versioning]	versioning	[Versioning] Bump release version

Note: Matching is case-insensitive. Common variations (singular/plural) are supported.

[vmoens]

LGTM thanks!