all: support lsp 3.15.3

[zchee]

Support lsp 3.15.3.

ref:

• https://microsoft.github.io/language-server-protocol/specifications/specification-3-15/

[codecov]

Codecov Report

Merging #16 (f5e54a0) into main (be98efe) will increase coverage by 0.4%.
The diff coverage is 61.1%.

@@           Coverage Diff           @@
##            main     #16     +/-   ##
=======================================
+ Coverage   59.2%   59.7%   +0.4%     
=======================================
  Files         27      33      +6     
  Lines       3344    4214    +870     
=======================================
+ Hits        1982    2518    +536     
- Misses      1337    1668    +331     
- Partials      25      28      +3     

Impacted Files	Coverage Δ
client.go	0.0% <ø> (ø)
client_gojay.go	0.0% <0.0%> (ø)
client_json.go	0.0% <0.0%> (ø)
general.go	100.0% <ø> (ø)
handler.go	0.0% <ø> (ø)
handler_gojay.go	0.0% <0.0%> (ø)
handler_json.go	0.0% <0.0%> (ø)
selectionrange.go	0.0% <0.0%> (ø)
selectionrange_gojay.go	0.0% <0.0%> (ø)
server.go	0.0% <0.0%> (ø)
... and 21 more

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