feat(config): support after and afterDeclarations AST transformers

[ahnpnl]

Summary

At the moment, we only support before AST transformers. There are 2 other types, after and afterDeclarations which we should support too. This PR does:

• Deprecate current way of defining astTransformers in ts-jest config by showing a warning message and instruct users how to migrate to the new way of config.

• Replace the current way of defining astTransformers with a new way, which is an object to be able to accept all 3 types of AST transformers.

• The old way of configuring will be removed in v27

Test plan

Added unit tests and e2e tests, Green CI

Does this PR introduce a breaking change?

• Yes
• No

Other information

N.A.

[coveralls]

Pull Request Test Coverage Report for Build 5459

• 45 of 45 (100.0%) changed or added relevant lines in 3 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.2%) to 92.936%

---

Totals
Change from base Build 5458:	0.2%
Covered Lines:	1092
Relevant Lines:	1127

---

💛 - Coveralls

[ahnpnl]

Hmm gonna a few extra tests as not all added codes are covered

[ahnpnl]

look good now, all new added codes are covered :)