enhancement(lua transform): Add version configuration option

[ghost]

This PR adds version configuration option to the lua transform. The version can take values 1 and 2, the default values is 1.

This also splits implementation for both versions, so all further changes on version 2 would not affect version 1.

Ref #2000.

[github-actions]

Great PR! Please pay attention to the following items before merging:

Files matching src/**:

• For each failure path, is there sufficient context logged for users to investigate the issue?
• Do the tests ensure that behavior is sane for inputs that don't meet normal assumptions (e.g. missing field, non-string, etc)?
• Did you add adequate documentation?

Files matching src/transforms/**:

• Did you add behavior tests (tests/behavior) that represent the behavior of this change? For example, testing for Vector's field path notation for nested fields.

This is an automatically generated QA checklist based on modified files

[binarylogic]

I would remove 2 until we actually support it. And, at the time, we should make sure it what is presented in the configuration example.

[binarylogic]

Ah, I see, you do have a v2 here. Does that implement the API discussed in the spec?

[ghost]

Ah, I see, you do have a v2 here. Does that implement the API discussed in the spec?

It is currently a duplicate of v1. I'm planning to gradually implement features from the RFC in v2, so although it is available, the exposed API for it will be very unstable until most of the features are there. So it makes sense to hide it until it is somewhat stabilized.

[binarylogic]

Looks great to me!