Add list template tags command

[rsrdesarrollo]

Proposed changes

Add CLI flag '-tgl' to list all the tags available on the templates (similar to -tl but for tags instead of templates)

Checklist

• Pull request is created against the dev branch
• All checks passed (lint, unit/integration/regression tests etc.) with my changes
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)

[olearycrew]

Thanks for this contribution @rsrdesarrollo I love this!

[xalgord]

this feature was much needed ❤️

[ehsandeep]

• fast processing of tags to reduce load time
• output format update with sorting
• jsonl format support

cc @Ice3man543

[ehsandeep]

$ ./nuclei -tgl -silent -j | head -n 10

{"tag":"cve","count":2416}
{"tag":"panel","count":1122}
{"tag":"wordpress","count":956}
{"tag":"exposure","count":895}
{"tag":"xss","count":890}
{"tag":"wp-plugin","count":836}
{"tag":"osint","count":804}
{"tag":"tech","count":673}
{"tag":"lfi","count":646}
{"tag":"misconfig","count":598}

$ ./nuclei -tgl -silent | head -n 10

cve (2416)
panel (1122)
wordpress (956)
exposure (895)
xss (890)
wp-plugin (836)
osint (804)
tech (673)
lfi (646)
misconfig (598)