Refactor tests

v0/tests/parser_imports.c2

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+module my_module;
+import other_module;

v0/tests/parser_module_name.c2

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+module my_module;

v0/tests/parser_public_imports.c2

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+module my_module;
+import public other_module;

v0/tests/tokenstream_comma.c2

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+a,b,c

v0/tests/tokenstream_info.c2

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+module main;

v0/tests/tokenstream_keywords_and_symbols.c2

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+module main; import stdio;

v0/tests/tokenstream_parentheses_and_brackets.c2

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+()[]

v0/tests/tokenstream_simple_keyword.c2

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+module

v0/tests/tokenstream_void_function_signature.c2

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+void main()

v0/tests/tokenstream_whitespace_ignored.c2

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+  module  
+	 import  ;