Run spxls in Web Worker

[nighca]

close #1187.

[qiniu-prow[bot]]

Skipping CI for Draft Pull Request. If you want CI signal for your change, please convert it to an actual PR. You can still manually trigger a test run with /test all

[nighca]

Without cancellation

Macbook Air M4 https://goplus-builder.qiniu.io/project/nighca/zombie

textDocument/completion (1) took 492ms
textDocument/completion (2) took 659ms
textDocument/completion (3) took 672ms
textDocument/completion (4) took 588ms
textDocument/completion (5) took 807ms
textDocument/completion (6) took 824ms
textDocument/completion (7) took 712ms
textDocument/completion (8) took 743ms
textDocument/completion (9) took 896ms
textDocument/completion (10) took 889ms

With cancellation

Macbook Air M4 https://goplus-builder.qiniu.io/project/nighca/zombie

textDocument/completion (1) took 529ms
textDocument/completion (4) took 434ms
textDocument/completion (7) took 406ms
textDocument/completion (10) took 413ms

[qiniu-ci]

This PR has been deployed to the preview environment. You can explore it using the preview URL.

[!WARNING] Please note that deployments in the preview environment are temporary and will be automatically cleaned up after a certain period. Make sure to explore it before it is removed. For any questions, contact the Go+ Builder team.