rest api: /debug/settings/pprof admin endpoint for debugging

[algorandskiy]

Note for reviewers

Most of this PR is autogenerated, actual changes are in these files:
daemon/algod/api/algod.oas2.json
daemon/algod/api/server/v2/handlers.go
daemon/algod/api/server/v2/test/handlers_test.go

Summary

A new PUT /debug/settings/pprof allows to control SetMutexProfileFraction and SetBlockProfileRate by passing non-negative rate values.

Test Plan

Added a unit test.
Run manual tests:

1. It is indeed available only with admin token
2. It produces non-empty profiles with

curl http://`cat ${ALGORAND_DATA}/algod.net`/debug/settings/pprof -H "X-Algo-API-Token: $(cat $ALGORAND_DATA/algod.token)"
{"message":"Invalid API Token"}

curl -XPUT http://`cat ${ALGORAND_DATA}/algod.net`/debug/settings/pprof -H "X-Algo-API-Token: $(cat $ALGORAND_DATA/algod.admin.token)" -d '{"block-rate":100,"mutex-rate":1}'
{"block-rate":0,"mutex-rate":0}

curl http://`cat ${ALGORAND_DATA}/algod.net`/debug/settings/pprof -H "X-Algo-API-Token: $(cat $ALGORAND_DATA/algod.admin.token)"
{"block-rate":100,"mutex-rate":1}

curl --silent -o algod.block.pprof http://`cat ${ALGORAND_DATA}/algod.net`/urlAuth/`cat ${ALGORAND_DATA}/algod.admin.token`/debug/pprof/block?seconds=20

curl --silent -o algod.mutex.pprof http://`cat ${ALGORAND_DATA}/algod.net`/urlAuth/`cat ${ALGORAND_DATA}/algod.admin.token`/debug/pprof/mutex?seconds=20

Mutex

Blocking

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 37 lines in your changes missing coverage. Please review.

Project coverage is 55.89%. Comparing base (6c91f52) to head (51eff69).
Report is 21 commits behind head on master.

❗ Current head 51eff69 differs from pull request most recent head 00c9e5d

Please upload reports for the commit 00c9e5d to get more accurate results.

Files	Patch %	Lines
daemon/algod/api/server/v2/handlers.go	0.00%	37 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6018      +/-   ##
==========================================
- Coverage   55.94%   55.89%   -0.06%     
==========================================
  Files         482      482              
  Lines       68310    68347      +37     
==========================================
- Hits        38219    38201      -18     
- Misses      27500    27551      +51     
- Partials     2591     2595       +4     

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