Add Input connection with deferred binding

[tgoldina]

These are minimal changes to make an input connection with deferred binding, which would allow us to have an input connection with the same dataset type as an output. (The input would have a different dataset reference than the output.)

This is the first step in creating a Quantum Graph, which would process images with persistence. In this use case, the images must be processed in order, each QuantumNode takes prior persistence state and produces its own.

Checklist

• ran Jenkins
• added a release note for user-visible changes to doc/changes

[codecov]

Codecov Report

Attention: Patch coverage is 68.42105% with 6 lines in your changes are missing coverage. Please review.

Project coverage is 82.38%. Comparing base (7c47f2a) to head (aa7e978).

Files	Patch %	Lines
python/lsst/pipe/base/connections.py	66.66%	3 Missing and 3 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #407      +/-   ##
==========================================
+ Coverage   82.36%   82.38%   +0.01%     
==========================================
  Files          93       93              
  Lines       10645    10644       -1     
  Branches     2021     2019       -2     
==========================================
+ Hits         8768     8769       +1     
+ Misses       1521     1520       -1     
+ Partials      356      355       -1     

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[TallJimbo]

Changes all look good, thanks! I don't recall whether you can just merge this directly or whether we should make a Jira ticket for it (maybe @timj does).

[timj]

Jira please. Tatiana should have access.

[timj]

Also can we have a news fragment please?

[timj]

I've created DM-43572 so this PR should be closed and reopened with the new ticket branch.