Add support for setting include paths via initializationParams

[Copilot]

This PR adds the ability to configure include paths dynamically through LSP initializationParams, addressing a key limitation for Neovim users where command-line arguments must be static but initialization options can be set dynamically.

Problem

Neovim's LSP configuration requires cmd and args to be static, making it impossible to dynamically configure include paths based on project context. While Neovim supports changing initializationParams via the before_init callback, protols didn't support include path configuration through this mechanism.

Solution

Extended the LSP initialization process to parse and use include paths from initializationParams.include_paths. The implementation:

• Integrates seamlessly: Merges with existing CLI and configuration file include paths
• Handles errors gracefully: Invalid formats are logged but don't crash the server
• Maintains compatibility: All existing functionality continues to work unchanged

Usage

Neovim users can now configure include paths dynamically:

require'lspconfig'.protols.setup{
  before_init = function(_, config)
    config.init_options = {
      include_paths = {
        "/usr/local/include/protobuf",
        "vendor/protos",
        "../shared-protos"
      }
    }
  end
}

Implementation Details

• Extended WorkspaceProtoConfigs to store initialization include paths
• Added parse_init_include_paths() function to handle JSON parsing with robust error handling
• Updated include path resolution to merge all sources (config file + CLI + initialization)
• Added comprehensive test coverage with 6 new test cases
• Updated documentation with usage examples

Testing

All existing tests continue to pass, plus new tests covering:

• Array format parsing
• String format parsing
• Invalid format handling
• Integration with existing include path sources
• Real-world usage scenarios

Fixes #90.

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[coder3101]

Nice work @copilot !