References improvements

[Techatrix]

This PR merges the code responsible for textDocument/rename, textDocument/references and textDocument/documentHighlight because they are very similar. And references.zig receives a large refactor. fixes #654

These features are still very buggy and i will address that in later PRs.

[llogick]

i'm sure you're ahead of me, so i'll ask here

wouldn't

        .anyframe_type,
        .@"defer",
        .@"errdefer",
        .@"comptime",
        .@"nosuspend",
        => {
            try symbolReferencesInternal(arena, locations, store, .{ .node = datas[node].lhs, .handle = handle }, decl, encoding);
        },

address #654 ?

[Techatrix]

This is now fixed in my refactor, but many bugs remain...

[SuperAuguste]

👏👏👏