txHandler: metrics for txpool.Remember

[algorandskiy]

Summary

Translate some Remember error codes into counters.

Test Plan

Added unit test to ensure all metrics but two that hard to trigger (ErrNoSpace, ErrTxPoolFeeError).

[codecov]

Codecov Report

Merging #4839 (e4a7da5) into master (b0ee6be) will increase coverage by 0.03%.
The diff coverage is 61.53%.

@@            Coverage Diff             @@
##           master    #4839      +/-   ##
==========================================
+ Coverage   54.03%   54.07%   +0.03%     
==========================================
  Files         426      427       +1     
  Lines       53409    53463      +54     
==========================================
+ Hits        28860    28909      +49     
+ Misses      22283    22281       -2     
- Partials     2266     2273       +7     

Impacted Files	Coverage Δ
data/pools/errors.go	0.00% <0.00%> (ø)
data/transactions/transaction.go	43.04% <0.00%> (ø)
ledger/ledgercore/error.go	0.00% <0.00%> (ø)
ledger/internal/eval.go	48.87% <21.42%> (-0.26%)	⬇️
data/pools/transactionPool.go	49.66% <38.88%> (-0.34%)	⬇️
data/transactions/verify/txn.go	73.72% <54.54%> (-0.74%)	⬇️
data/transactions/error.go	50.00% <66.66%> (+16.66%)	⬆️
data/transactions/logic/eval.go	90.16% <83.33%> (+0.01%)	⬆️
data/txHandler.go	60.23% <94.28%> (+11.59%)	⬆️
network/wsPeer.go	67.06% <0.00%> (-1.91%)	⬇️
... and 10 more

📣 We’re building smart automated test selection to slash your CI/CD build times. Learn more

[brianolson]

LGTM; some of these new metrics look really useful

[cce]

This makes me want to add the same new err types and counter breakdowns in TestTransactionGroup as well, the empty group value and inconsistent group value stuff will all call be caught first in TestTransactionGroup