Reconcile unrealized parser casts to pr.cast

[xlauko]

• adds -vast-parser-reconcile-casts pass to eliminate intermediate unrealized casts to pr.cast
• adds simple folds for parse operations

[github-actions]

Cpp-Linter Report ⚠️

Some files did not pass the configured checks!

clang-format (v19.1.1) reports: 4 file(s) not formatted

• lib/vast/Conversion/Parser/ReconcileCasts.cpp
• lib/vast/Conversion/Parser/ToParser.cpp
• lib/vast/Conversion/Parser/Utils.hpp
• lib/vast/Dialect/Parser/Ops.cpp

clang-tidy (v19.1.1) reports: 1 concern(s)

• include/vast/Conversion/Parser/Passes.hpp:20:14: error: [clang-diagnostic-error]

  'vast/Conversion/Parser/Passes.h.inc' file not found

     20 |     #include "vast/Conversion/Parser/Passes.h.inc"
        |              ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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