feat: Add doctor command (#112)

* Add firecrawl doctor command (ENG-4883)

* Fix doctor support diagnostics

* Refine doctor credit label

* Polish doctor option handling

* Respect terminal color support in doctor

* Bump CLI version to 1.18.7

Author: abimaelmartell

package.json

@@ -1,6 +1,6 @@
 {
   "name": "firecrawl-cli",
-  "version": "1.18.6",
+  "version": "1.19.0",
   "description": "Command-line interface for Firecrawl. Scrape, crawl, and extract data from any website directly from your terminal.",
   "main": "dist/index.js",
   "bin": {