dialects: (hw) Add hw.instance operation

[Moxinilian]

This PR adds a subset of the hw.instance operation, the dual of hw.module for instantiation.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.78%. Comparing base (34fb769) to head (9315af2).
Report is 8 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2486      +/-   ##
==========================================
- Coverage   89.80%   89.78%   -0.02%     
==========================================
  Files         350      350              
  Lines       42890    43146     +256     
  Branches     6370     6427      +57     
==========================================
+ Hits        38516    38740     +224     
- Misses       3430     3453      +23     
- Partials      944      953       +9     

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[Moxinilian]

Codecov you have no idea how happy I am right now.

[PapyChacal]

Can you add an example with extra attributes on an hw.instance? I think the printer is missing it?

[Moxinilian]

Nice catch

[lucjaulmes]

Some tiny nits but otherwise LGTM.