1. fix(rpc): Fix slow getblock RPC (verbose=1) using transaction ID index

[teor2345]

Motivation

Zebra's lightwalletd sync takes a lot longer than zcashd's (7h vs 5h).

Fixes #5298.

Solution

Use the transaction ID index for verbose getblock RPC requests, rather than deserializing the entire block, then hashing all the transactions in the block.

Also add timing output to zcash-rpc-diff.

Review

This is a routine fix.

Reviewer Checklist

• Will the PR name make sense to users?
  • Does it need extra CHANGELOG info? (new features, breaking changes, large changes)
• Are the PR labels correct?
• Does the code do what the ticket and PR says?
• How do you know it works? Does it have tests?

[codecov]

Codecov Report

Merging #5307 (9f55229) into main (9849d14) will decrease coverage by 0.04%.
The diff coverage is 78.18%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5307      +/-   ##
==========================================
- Coverage   79.15%   79.10%   -0.05%     
==========================================
  Files         308      308              
  Lines       39479    39560      +81     
==========================================
+ Hits        31248    31295      +47     
- Misses       8231     8265      +34     

[oxarbitrage]

I reviewed this PR and it looks great to me. I am not approving as i am not assigned and someone else might have pending comments.

[upbqdn]

Everything looks great.