Add codeLens feature for Language Server

[rasika]

Purpose

Implenting Code Lens feature for Ballerina. Code lenses are the code links in your code. They often used to provide additional information of the code lines and allow actionable commands.

Code Lenses

Customizing Code Lenses

[nadeeshaan]

Missing full stop

[nadeeshaan]

is it possible to merge these two if conditions to a single one?

[rasika]

Since there's a casting involved; bringing it into a single line affects the readability. WDYT?

[nadeeshaan]

Great, let's keep this way :)

[codecov-io]

Codecov Report

Merging #13297 into master will increase coverage by 0.05%.
The diff coverage is 65.31%.

@@             Coverage Diff              @@
##             master   #13297      +/-   ##
============================================
+ Coverage      59.9%   59.96%   +0.05%     
  Complexity      659      659              
============================================
  Files          2146     2156      +10     
  Lines        104029   104360     +331     
  Branches      13253    13301      +48     
============================================
+ Hits          62320    62580     +260     
- Misses        36483    36544      +61     
- Partials       5226     5236      +10

Impacted Files	Coverage Δ	Complexity Δ
tool-plugins/vscode/src/docs/renderer.ts	0% <ø> (ø)	0 <0> (ø)	⬇️
.../langserver/common/constants/CommandConstants.java	66.66% <ø> (ø)	0 <0> (ø)	⬇️
.../ballerinalang/langserver/compiler/LSCompiler.java	35.77% <ø> (-0.83%)	0 <0> (ø)
tool-plugins/vscode/src/diagram/activator.ts	0% <0%> (ø)	0 <0> (ø)	⬇️
tool-plugins/vscode/src/api-editor/activator.ts	0% <0%> (ø)	0 <0> (ø)	⬇️
tool-plugins/vscode/src/docs/activator.ts	0% <0%> (ø)	0 <0> (ø)	⬇️
...rver/codelenses/LSCodeLensesProviderException.java	0% <0%> (ø)	0 <0> (?)
...lerinalang/langserver/BallerinaLanguageServer.java	87.34% <100%> (+0.32%)	0 <0> (ø)	⬇️
.../ballerinalang/langserver/command/CommandUtil.java	66.44% <100%> (ø)	0 <0> (ø)	⬇️
tool-plugins/vscode/src/core/extension.ts	19.48% <25%> (-0.39%)	0 <0> (ø)
... and 36 more

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[nadeeshaan]

Reviewed