config: Add MaxBlockHistoryLookback option

[ohill]

Summary

There is no way to request a node to store more blocks if it is not archival. This adds a MaxBlockHistoryLookback similar to MaxAcctLookback config option.

Test Plan

No tests yet

[CLAassistant]

All committers have signed the CLA.

[codecov]

Codecov Report

Merging #5749 (63c4c79) into master (ea20873) will increase coverage by 0.00%.
Report is 14 commits behind head on master.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #5749   +/-   ##
=======================================
  Coverage   55.57%   55.57%           
=======================================
  Files         476      476           
  Lines       66857    66859    +2     
=======================================
+ Hits        37156    37160    +4     
+ Misses      27177    27175    -2     
  Partials     2524     2524           

Files	Coverage Δ
config/localTemplate.go	72.02% <ø> (ø)
ledger/ledger.go	69.04% <100.00%> (+0.15%)	⬆️

... and 8 files with indirect coverage changes

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[jannotti]

Seems good to me.

Do we ever complain about non-sensical combinations of config? If someone sets this to, say, 3000 but also has Archival set, they are probably confused.

[algorandskiy]

the code LGTM but please add a unit test and perform a manual test.

[algorandskiy]

Thank you for the change!

[ohill]

Manually tested after catchpoint restore & running a node for a little while with "MaxBlockHistoryLookback": 1500 set:

$ last_round=$(curl -s -H "X-Algo-API-Token: $(cat algod.token)" localhost:8080/v2/status | jq '.["last-round"]') && curl -s -o /dev/null -w "%{http_code}" -H "X-Algo-API-Token: $(cat algod.token)" "localhost:8080/v2/blocks/$((last_round - 1500))"
200
$ last_round=$(curl -s -H "X-Algo-API-Token: $(cat algod.token)" localhost:8080/v2/status | jq '.["last-round"]') && curl -s -o /dev/null -w "%{http_code}" -H "X-Algo-API-Token: $(cat algod.token)" "localhost:8080/v2/blocks/$((last_round - 1501))"
404