LALRPOP based parser

[teofr]

The PR is huge, but most of the changes are generated or snapshot tests. The actual changes can be summarised as:

• We create a ParserModel, where each item from the language is transformed into a model of an LALRPOP rule
• From the ParserModel we generate an actual LALRPOP grammar (grammar.lalrpop.jinja2)
• We add a ParserOptions construct to the language definition, allowing for some grammar specific options
  • Some complex language items have their rules written by hand within the language definition, these are copied verbatim. I tried to be very didactic in the comments explaining this manual rules, if something is not clear please let me know.
• The pragma and assembly blocks require context switching from the lexer, until then they're basically being ignored
• These are the tests that generate different ASTs between V1 and V2, please review them carefully:
  • solidity_cargo_tests cst::cst_output::generated::source_unit::braces_inside_assembly: This needs assembly blocks to be parsed correctly.
  • solidity_cargo_tests cst::cst_output::generated::source_unit::state_variable_function: V1 parse this function (uint a) internal internal foo; as the function type having two internal attributes, but the second should be an attribute of the state variable, this works as expected on V2.
  • solidity_cargo_tests cst::cst_output::generated::source_unit::unreserved_keywords: V1 can't parse this uint transient;, V2 correctly parse it as an uint with the transient identifier (not a storage attribute).

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