Add support for passing configuration to VLS.

[ascott18]

Adds support for configuring VLS. All VLS configuration (that which is defined in getDefaultVLSConfig) is candidates for customization. Configuration is passed via CLI arguments in build mode, and by workerData in serve mode.

Tested on Windows 10 and Ubuntu 18.04 (via WSL).

Fixes #85.

[codecov-commenter]

Codecov Report

Merging #86 (1c375c6) into v0.4.x (2f7a4b4) will decrease coverage by 1.29%.
The diff coverage is 7.69%.

@@            Coverage Diff             @@
##           v0.4.x      #86      +/-   ##
==========================================
- Coverage   38.13%   36.84%   -1.30%     
==========================================
  Files          14       14              
  Lines         645      665      +20     
  Branches      127      140      +13     
==========================================
- Hits          246      245       -1     
- Misses        397      418      +21     
  Partials        2        2              

Impacted Files	Coverage Δ
...ckages/vite-plugin-checker/src/checkers/vls/cli.ts	0.00% <0.00%> (ø)
...vite-plugin-checker/src/checkers/vls/initParams.ts	25.00% <ø> (ø)
packages/vite-plugin-checker/src/main.ts	78.66% <ø> (-0.29%)	⬇️
packages/vite-plugin-checker/src/types.ts	100.00% <ø> (ø)
...ite-plugin-checker/src/checkers/vls/diagnostics.ts	12.58% <7.14%> (-1.16%)	⬇️
...kages/vite-plugin-checker/src/checkers/vls/main.ts	42.85% <12.50%> (-8.87%)	⬇️

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[fi3ework]

Thanks @ascott18! This will be released in 0.4.0. Great PR!