Feature/local cfg nested calls

[Galfurian]

What this PR does

Adds support for calling a local CompositeMethodNode from another local CompositeMethodNode (same data model), so complex logic can be split across smaller CFG methods instead of one long CFG.

Why

Previously, local CallMethodNode effectively only handled AsyncMethodNode calls. Nested local composite calls were not supported, which was the gap raised in the issue.

Main changes

• Extended local method-call execution to accept local composite method targets.
• Added nested execution handling so parent CFGs can pause/resume correctly when a child composite method is still active.
• Added completion-result handling for nested composite contexts.
• Added/updated tests to cover nested local composite call behavior.
• Added a minimal example (nested_local_cfg_call.py) with clear logging that shows parent -> child CFG call flow and returned values.
• Aligned dependency declarations (requirements-dev.txt, pyproject.toml) for consistency with used/runtime packages.

Validation

• Focused behavior/composite test suites pass after the change.
• Example script runs and logs the expected nested call sequence clearly.