feat: add 'mac' primitive for 'net.HardwareAddr' (MAC)

[lukasmalkmus]

Very simple PR that adds a new string primitive mac to be interpreted as a net.HardwareAddr, just like ip -> netip.Addr.

Marking as draft as I haven't added any integration test for the generator. I wonder where that should go. Should I create a new spec in the _testdata folder or add to an existing one? Also not suer about the Array functions. Those exist for the UUID primitive but not for e.g. the IP one? Why is that?

Anything I need to keep in mind?

If I can get this landed, I'll send a PR to the docs repo, as well.

Cheers!

[codecov]

Codecov Report

Attention: 9 lines in your changes are missing coverage. Please review.

Comparison is base (d5fceb0) 72.47% compared to head (9c84f12) 73.79%.
Report is 2 commits behind head on main.

Files	Patch %	Lines
conv/decode.go	0.00%	4 Missing ⚠️
conv/encode.go	0.00%	3 Missing ⚠️
gen/ir/faker.go	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1165      +/-   ##
==========================================
+ Coverage   72.47%   73.79%   +1.32%     
==========================================
  Files         187      188       +1     
  Lines       15049    12659    -2390     
==========================================
- Hits        10907     9342    -1565     
+ Misses       3608     2784     -824     
+ Partials      534      533       -1     

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[lukasmalkmus]

Forced pushed with some more changes I discovered by just global searching for UUID and going from there. Codecov isn't to happy but other types are not tested on those paths, as well.

Guess I need to alter one of the spaces with the mac format?

[tdakkota]

Format should be handled here too:

ogen/gen/ir/json.go

Line 126 in 092ca33

switch f := s.Format; f {