feat: bridge for git initial support

[ishche]

Checklist:

• Each of my commits contains one meaningful change
• I have performed rebase of my branch on top of the development
• I have performed a self-review of my own code
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• I have checked my code and corrected any misspellings

[VitGottwald]

Please, prefer VS code APIs which are universal across all environments instead of node specific APIs.

Typical example node:fs => vscode.workspace.fs and node:path => vscode.Uri.

[slavek-kucera]

pgCfg.preprocessor in the else branch may be undefined.

if (typeof pgCfg.preprocessor === "string") {
  dialects.push(pgCfg.preprocessor);
}
else if (Array.isArray(pgCfg.preprocessor)) {
  for (const pp of pgCfg.preprocessor) {
    if (typeof pp === "object" && pp && "name" in pp) {
      dialects.push(pp.name);
    }
    else if (typeof pp === "string") {
      dialects.push(pp);
    }
  }
}
else if (pgCfg.preprocessor && typeof pgCfg.preprocessor === "object" && "name" in pgCfg.preprocessor) {
  dialects.push(pgCfg.preprocessor.name);
}