Handle constructors in extraction semantic.

[aravij]

Fix #86
Previous PR fixed inly block-statement graph creation, but there was need to handle constructors in extraction semantic step.

[lyriccoder]

I still have the same error:

Traceback (most recent call last):
  File "D:\git\veniq\veniq\ast_framework\block_statement_graph\_block_extractors.py", line 15, in extract_blocks_from_statement
    return _block_extractors[statement.node_type](statement)
KeyError: <ASTNodeType.CLASS_DECLARATION: 17>

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "D:\git\veniq\veniq\dataset_collection\validation.py", line 144, in validate_row
    opport = find_extraction_opportunities(ast_subtree)
  File "D:\git\veniq\veniq\dataset_collection\validation.py", line 28, in find_extraction_opportunities
    statements_semantic = extract_method_statements_semantic(method_ast)
  File "D:\git\veniq\veniq\baselines\semi\extract_semantic.py", line 12, in extract_method_statements_semantic
    block_statement_graph = build_block_statement_graph(method_ast)
  File "D:\git\veniq\veniq\ast_framework\block_statement_graph\builder.py", line 15, in build_block_statement_graph
    root_index = _build_graph_from_statement(method_ast.get_root(), graph)
  File "D:\git\veniq\veniq\ast_framework\block_statement_graph\builder.py", line 26, in _build_graph_from_statement
    new_block_index = _build_graph_from_block(block, graph)
  File "D:\git\veniq\veniq\ast_framework\block_statement_graph\builder.py", line 40, in _build_graph_from_block
    new_statement_index = _build_graph_from_statement(statement, graph)
  File "D:\git\veniq\veniq\ast_framework\block_statement_graph\builder.py", line 24, in _build_graph_from_statement
    blocks = extract_blocks_from_statement(statement)
  File "D:\git\veniq\veniq\ast_framework\block_statement_graph\_block_extractors.py", line 17, in extract_blocks_from_statement
    raise NotImplementedError(f"Node {statement.node_type} is not supported.")
NotImplementedError: Node Class declaration is not supported.
100%|██████████| 1/1 [00:00<00:00, 117.67it/s]
D:\git\veniq\venv\lib\site-packages\numpy\core\fromnumeric.py:3372: RuntimeWarning: Mean of empty slice.
  return _methods._mean(a, axis=axis, dtype=dtype,
D:\git\veniq\venv\lib\site-packages\numpy\core\_methods.py:170: RuntimeWarning: invalid value encountered in double_scalars
  ret = ret.dtype.type(ret / rcount)

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[lyriccoder]

could you please update branch and then create a new issue?

[lyriccoder]

ok, i've tested