internal/lsp/cache: improve open out of workspace file full parse.

[pavlelee]

Normal mode solves the problem of excessive memory consumption, but if my machine has enough memory, I still want a complete code prompt experience

[pavlelee]

fix golang/go#47660

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Patch Set 4: Code-Review-2

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Message from Pavle Lee:

Patch Set 4: Code-Review+1

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Message from Pavle Lee:

Patch Set 4:

(1 comment)

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Message from Pavle Lee:

Patch Set 4: -Code-Review

(1 comment)

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