Merge #199: Feat/vscode enhance

0f46aef Bump version to 0.3.0 (Patotking12)
dc3e43e vscode: Add build integration, status bar, snippets, and file icons (Patotking12)
4b72c7c lsp: Add document symbols, signature help, semantic tokens, and witness validation (Patotking12)
e8abe53 Update .gitignore (Patotking12)

Pull request description:

  Added build integration to the VSCode extension with a task provider that runs simc and shows output in a dedicated channel. Also added code snippets for common patterns and custom file icons for .simf and .wit files.

  On the LSP side, implemented document symbols for the outline view, signature help for function parameter hints, semantic tokens for AST-based highlighting of functions and namespaces, and witness file validation that checks types and reports missing or extra fields in real-time.

ACKs for top commit:
  KyrylR:
    utACK 0f46aef

Tree-SHA512: 8824f820c2d63e1ccbe0028b4eb67609b0c810ad199e61628bf134e56a70ffd8c40ddd5a14b057a4ed97b17cbf6eca1cfc5b0f30d011d354abcf30f36f75d057

Author: KyrylR

.gitignore

@@ -24,3 +24,6 @@ node_modules/
 
 # VSCode extension package
 *.vsix
+
+# macOS
+.DS_Store

lsp/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "simplicityhl-lsp"
-version = "0.2.1"
+version = "0.3.0"
 edition = "2021"
 rust-version = "1.79"
 description = "Language Server Protocol (LSP) server for SimplicityHL."