feat(client/v2): support definitions of inner messages (backport #22890)

[mergify]

Description

Closes: #18310

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Summary by CodeRabbit

• New Features

  • Support for flattening inner message fields in AutoCLI as positional arguments.
  • Enhanced documentation for GeneratorParams struct fields.

• Bug Fixes

  • Resolved issues with *big.Int unmarshalling in transactions.

• Documentation

  • Updated changelog for client/v2 with new features, improvements, and breaking changes.
  • Expanded README documentation for autocli, detailing usage of flattened fields in positional arguments.

• Tests

  • Added new test function TestMsgWithFlattenFields to validate command execution.
  • Updated test cases to reflect changes in permission level representations.

• Chores

  • Introduced a new JSON structure in flatten-output.golden for parameter updates.

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This is an automatic backport of pull request #22890 done by [Mergify](https://mergify.com).

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