feat: set up LSP4IJ support for KCL

[RehanChalana]

• Initialized KCLLanguageServer and KCLLanguageServerFactory
• Updated gradle.properties to include com.redhat.devtools.lsp4ij:0.4.0 in platformPlugins
• Added LSP server dependency and language mapping for KCL in plugin.xml

1. Does this PR affect any open issues?(Y/N) and add issue references (e.g. "fix #123", "re #123".):

• [x] N
• [ ] Y

2. What is the scope of this PR (e.g. component or file name):

/src/java/io/kusionstack/kcl and /src/resources

3. Provide a description of the PR(e.g. more details, effects, motivations or doc link):

• [ ] Affects user behaviors
• [ ] Contains syntax changes
• [ ] Contains variable changes
• [x] Contains experimental features
• [ ] Performance regression: Consumes more CPU
• [ ] Performance regression: Consumes more Memory
• [x] Other

4. Are there any breaking changes?(Y/N) and describe the breaking changes(e.g. more details, motivations or doc link):

• [x] N
• [ ] Y

5. Are there test cases for these changes?(Y/N) select and add more details, references or doc links:

• [ ] Unit test
• [ ] Integration test
• [ ] Benchmark (add benchmark stats below)
• [x] Manual test (add detailed scripts or steps below)
• [ ] Other

I was able to test the LSP support by manually running ./gradlew runIde command.

[Peefy]

cc @He1pa Could you help review it?

[He1pa]

did you have try to build the plugin by ./gradlew build and install it to test?

[angelozerr]

Thanks @RehanChalana for having used LSP4IJ!

@Peefy @He1pa @RehanChalana could you please create a PR to add your LS in https://github.com/redhat-developer/lsp4ij?tab=readme-ov-file#who-is-using-lsp4ij and if you think LSP4IJ is good, could you add a review at https://plugins.jetbrains.com/plugin/23257-lsp4ij/reviews to help us to promote LSP4IJ. Thanks!

[angelozerr]

Please note that LSP4IJ 0.5.0 has been released yesterday.

[Peefy]

Thank you! @angelozerr

I've opened a PR here: https://github.com/redhat-developer/lsp4ij/pull/518