Feat: flatten tree BlockState for SemanticStackContext

[mrLSD]

Description

The current BlockState is represented as a tree with one parent and many children. It represents blocks as a tree with branches and leaves. Each block state has a context that contains SemanticStack. It means that all contexts also represented as a tree. Related to issue #16.

🔦 To simplify the fetching process for Codegen backends, there is an added the changes:

• for the parent BlockState "flatten" all children's contexts. It means parent context will also include children's contexts. And it has linear representations. At the same time, it has children BlockState with their own context
• root BlockState contains flattened linear context related to all children's BlockState context.

Tests

• Added additional tests for all related flattened BoclState contexts.
• Added tests for BlockState parent invokation.

🏦 BlockState changes

Added traits:

• SemanticContext
• GlobalSemanticContext

For BlockState trait SemanticContext implementation added invokcation for all parent BlockState nodes in context. It's guaranteed, that all parent context nodes have the same leaves as children. And root contains full representation of children's instructions.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (ef93e56) 100.00% compared to head (c226698) 100.00%.

Additional details and impacted files

@@            Coverage Diff             @@
##            master       #19    +/-   ##
==========================================
  Coverage   100.00%   100.00%            
==========================================
  Files            9         9            
  Lines         1650      1758   +108     
==========================================
+ Hits          1650      1758   +108     

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