Add tailscale tools command

[kaelemc]

heavily inspired from sshx/gotty

The idea is to connect the management subnet to a tailnet and advertise that subnet onto the tailnet.

[codecov]

Codecov Report

❌ Patch coverage is 11.63522% with 562 lines in your changes missing coverage. Please review.
✅ Project coverage is 53.26%. Comparing base (f98a1cd) to head (2c33f2f).
⚠️ Report is 9 commits behind head on main.

Files with missing lines	Patch %	Lines
cmd/tools_tailscale.go	10.38%	556 Missing and 5 partials ⚠️
core/destroy.go	75.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2765      +/-   ##
==========================================
- Coverage   53.87%   53.26%   -0.62%     
==========================================
  Files         207      207              
  Lines       22133    23337    +1204     
==========================================
+ Hits        11925    12431     +506     
- Misses       8980     9690     +710     
+ Partials     1228     1216      -12     

Files with missing lines	Coverage Δ
cmd/options.go	100.00% <100.00%> (ø)
cmd/tools.go	88.67% <100.00%> (-1.33%)	⬇️
core/destroy.go	59.93% <75.00%> (+0.32%)	⬆️
cmd/tools_tailscale.go	10.38% <10.38%> (ø)

... and 24 files with indirect coverage changes

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