perf(language-core): cache and reuse inline ts asts during full updates

[KazariEX]

Originally, we held the inline TS ASTs within their respective attribute nodes. While this approach allowed them to persist during incremental updates of the template, when edits break the template structure and triggered a fallback to full updates, all inline TS would be re-parsed—even if their content remained entirely unchanged.

Now, we held these inline TS ASTs in a Map property of the template AST and perform cache checks when recomputing the template AST. This change brings two key benefits:

1. Most inline TS ASTs will be reused during full updates.
2. Inline TS with same content will share the same AST.

[pkg-pr-new]

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commit: 44a24d0