[compiler-v2] add test cases for lambda

[brmataptos]

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Description

Add a /lambda/ test subdir for move-compiler-v2, and test it with LAMBDA experiments off (.exp) and on (.lambda.exp).

How Has This Been Tested?

This is just a test.

Key Areas to Review

Observe baselines. Can you think of any other useful tests to include? If not, just approve, please.

Type of Change

• [ ] New feature
• [ ] Bug fix
• [ ] Breaking change
• [ ] Performance improvement
• [ ] Refactoring
• [ ] Dependency update
• [ ] Documentation update
• [x] Tests

Which Components or Systems Does This Change Impact?

• [ ] Validator Node
• [ ] Full Node (API, Indexer, etc.)
• [ ] Move/Aptos Virtual Machine
• [ ] Aptos Framework
• [ ] Aptos CLI/SDK
• [ ] Developer Infrastructure
• [x] Move Compiler
• [ ] Other (specify)

Checklist

• [x] I have read and followed the CONTRIBUTING doc
• [x] I have performed a self-review of my own code
• [x] I have commented my code, particularly in hard-to-understand areas
• [x] I identified and added all stakeholders and component owners affected by this change as reviewers
• [x] I tested both happy and unhappy path of the functionality
• [x] I have made corresponding changes to the documentation