Leader qos part 2 - add stage to find packet's sender stake

[tao-stones]

Problem

Packet Sender's stake can be helpful information for Leader's prioritization algo.

Summary of Changes

• Add find_packet_sender_stake_stage, insert it between streamer and sigverify_stage.
• The new stage finds packet senders' stakes from gossip, set it to packet.meta.sender_stake field.

Fixes #

[carllin]

nit: One thing we've started doing is using Measure::this()

solana/core/src/banking_stage.rs

Lines 589 to 593 in 46dfbc9

	let (bank_start, poh_recorder_lock_time) = Measure::this(
	|_| poh_recorder.lock().unwrap().bank_start(),
	(),
	"poh_recorder_lock",
	);

to make some of these measurement code blocks clearer

[tao-stones]

I find using Measure::this on simple function with one or no param is cleaner than if function takes multiple params. Not huge fan of adding another indentation tho; nor the mixed use of Measure::this and "Measure::start` in same code block.

[codecov]

Codecov Report

Merging #23690 (f999ad2) into master (2da4e3e) will decrease coverage by 0.0%.
The diff coverage is 82.1%.

@@            Coverage Diff            @@
##           master   #23690     +/-   ##
=========================================
- Coverage    81.8%    81.7%   -0.1%     
=========================================
  Files         581      582      +1     
  Lines      158312   158437    +125     
=========================================
+ Hits       129518   129534     +16     
- Misses      28794    28903    +109     

[tao-stones]

@carllin do you think can give this PR a green light, or there are rooms to improve?