Workaround for node 18 support

[skovhus]

I've looked into the issue behind #353 and the node.js support for fetch conflicts with some of the wasm code generated by emscripten – a downstream fix is here and issue here.

I've validated this by disabling fetch using --no-experimental-fetch when running test:

node --no-experimental-fetch  node_modules/.bin/jest server/src/__tests__/server.test.ts

This PR patches the node global environment to work around this. This should be safe as only the language server should be running in the same process.

[codecov]

Codecov Report

Merging #404 (9b08bcc) into master (9a62f73) will decrease coverage by 0.18%.
The diff coverage is 33.33%.

@@            Coverage Diff             @@
##           master     #404      +/-   ##
==========================================
- Coverage   74.58%   74.39%   -0.19%     
==========================================
  Files          19       19              
  Lines         657      660       +3     
  Branches      115      116       +1     
==========================================
+ Hits          490      491       +1     
- Misses        151      153       +2     
  Partials       16       16              

Impacted Files	Coverage Δ
server/src/parser.ts	80.00% <33.33%> (-20.00%)	⬇️

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