FixedSizeQueue:
- Enqueue would always stop one short of filling the capacity
- Fill would only _replace_ existing items. It was only used in a place where there were not existing items! Removed the method entirely.
LLamaGrammarElement:
- Converted into a `record` struct, removed all of the (now unnecessary) equality stuff.
- Removed all `record struct` uses in native code
- Removed usage of `readonly` in native structs
Minor fix:
- Added sequential layout to `LLamaModelQuantizeParams`
- Made all the mechanics of grammar parsing (GBNFGrammarParser, ParseState) internal. Just call `Grammar.Parse("whatever")`.
- Added a `GrammarRule` class which validates elements on construction (this allows constructing grammar without parsing GBNF).
- It should be impossible for a `GrammarRule` to represent an invalid rule.
Martin Evans
Mihai