Implement RFC 45: Move hdl.Memory to lib.Memory.

[wanda-phi]

Fixes #216.

[codecov]

Codecov Report

Attention: 4 lines in your changes are missing coverage. Please review.

Comparison is base (6d65dc1) 85.61% compared to head (93554fd) 85.87%.

Files	Patch %	Lines
amaranth/lib/memory.py	99.15%	1 Missing and 1 partial ⚠️
amaranth/hdl/_mem.py	95.65%	1 Missing ⚠️
amaranth/sim/pysim.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1142      +/-   ##
==========================================
+ Coverage   85.61%   85.87%   +0.26%     
==========================================
  Files          42       43       +1     
  Lines        8433     8675     +242     
  Branches     1998     2065      +67     
==========================================
+ Hits         7220     7450     +230     
- Misses       1016     1024       +8     
- Partials      197      201       +4     

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[whitequark]

Did we decide to get rid of MemoryIdentity in the end?

[wanda-phi]

Did we decide to get rid of MemoryIdentity in the end?

I ended up including it, since this allows us to recognize memories of all kinds (old and new) as "something that has an _identity that is MemoryInstance" in the simulator, avoiding a dependency.

Still not sure if this is the way to go.

[whitequark]

Can you back out the docs rst file? I'd like to improve these before publishing, but I don't want to block the PR on that.

[wanda-phi]

Can you back out the docs rst file? I'd like to improve these before publishing, but I don't want to block the PR on that.

Done

[whitequark]

Thanks!