Add method body with cfg and locals

[Lipen]

This PR adds val body: EtsMethodBody with CFG and locals (taken from IR).

Note that all "locals" (that could be found in IR) that do not present in this list of locals, are actually not locals, but probably global variables or other out of scope refs. For example x := 42 when method.body.locals list does not contain x, actually means "modify the global variable x", not local.

[Copilot]

Pull Request Overview

This PR restructures the ETS method model by introducing a EtsMethodBody class that encapsulates both CFG (Control Flow Graph) and locals information, moving away from the direct cfg property on EtsMethod. The body contains locals extracted from IR, where missing locals indicate global variables rather than local ones.

• Introduces EtsMethodBody class containing CFG and locals
• Updates method building to populate locals from IR during conversion
• Maintains backward compatibility with deprecated _cfg property

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
Method.kt	Adds EtsMethodBody class and refactors EtsMethod interface to use body instead of direct CFG property
Convert.kt	Updates method builder to extract locals from DTO and populate method body with both CFG and locals
EtsCfgDslTest.kt	Updates test to use new method.body.cfg instead of deprecated method._cfg

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[github-actions]

Test Results

  217 files  ±0    217 suites  ±0   15m 54s ⏱️ +2s
  729 tests ±0    717 ✅ ±0  12 💤 ±0  0 ❌ ±0 
1 997 runs  ±0  1 947 ✅ ±0  50 💤 ±0  0 ❌ ±0 

Results for commit acfc880. ± Comparison against base commit 0a50288.

♻️ This comment has been updated with latest results.