src/realm: allow for XferDes objects to be reset

[rohany]

This commit ports the XferDes reset functionality from #391.

[rohany]

@artempriakhin do you have some suggestions for how to test this in isolation? I was playing around with a few things this morning and didn't find any of them particularly satisfying / self contained:

• None of the types changed here are really POD types with byte equality. I can add tests that check all the "resetted" fields are indeed "reset", but it doesn't do anything for us in the future to avoid someone adding a new field and not resetting it.
• I could try more end-to-end tests that check an XD is actually replayable, but this isn't a unit test and more and requires a good amount infrastructure I have in the subgraph PR to actually extract an XD to run it back-to-back several times.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 94 lines in your changes missing coverage. Please review.
✅ Project coverage is 29.00%. Comparing base (7cd30c1) to head (835aae2).
⚠️ Report is 14 commits behind head on main.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
src/realm/transfer/channel.cc	0.00%	71 Missing ⚠️
src/realm/transfer/address_list.cc	0.00%	12 Missing ⚠️
src/realm/transfer/transfer.cc	0.00%	8 Missing ⚠️
src/realm/transfer/transfer.inl	0.00%	2 Missing ⚠️
src/realm/transfer/lowlevel_dma.h	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #416      +/-   ##
==========================================
+ Coverage   28.22%   29.00%   +0.78%     
==========================================
  Files         193      194       +1     
  Lines       39849    40318     +469     
  Branches    14433    14614     +181     
==========================================
+ Hits        11246    11695     +449     
  Misses      28206    28206              
- Partials      397      417      +20     

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