Add query option override for Broker MinGroupTrimSize

[vvivekiyer]

1. Added a queryOption override minBrokerGroupTrimSize for config pinot.broker.min.group.trim.size
2. Reused the generic queryOption override groupTrimThreshold at the broker reduce stage as well

Note: For existing users of groupTrimThreshold queryOption, they can see trimming kicking in going forward. I'm open to suggestions if we want to decouple and create a separate queryOption for broker.

[codecov-commenter]

Codecov Report

Attention: 10 lines in your changes are missing coverage. Please review.

Comparison is base (2beb9a4) 61.61% compared to head (ffccff7) 61.61%.
Report is 11 commits behind head on master.

Files	Patch %	Lines
...inot/core/query/reduce/StreamingReduceService.java	0.00%	7 Missing ⚠️
...e/pinot/core/query/reduce/BrokerReduceService.java	71.42%	0 Missing and 2 partials ⚠️
...e/pinot/common/utils/config/QueryOptionsUtils.java	50.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             master   #11984    +/-   ##
==========================================
  Coverage     61.61%   61.61%            
- Complexity      207     1150   +943     
==========================================
  Files          2385     2385            
  Lines        129214   129266    +52     
  Branches      20003    20014    +11     
==========================================
+ Hits          79613    79649    +36     
- Misses        43801    43815    +14     
- Partials       5800     5802     +2     

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[Jackie-Jiang]

LGTM otherwise

We may keep the same group trim threshold the same across the query lifecycle. Ideally we should also use the same group trim size everywhere, but we kept them separate for backward compatibility where segment level trim is off by default. We may consider unifying them in the future

[Jackie-Jiang]

Let's follow the same convention by assuming queryOptions is not null

Suggested change

	if (queryOptions == null) {
	return null;
	}

[vvivekiyer]

Moved this check into (Streaming/Broker)ReduceService. This check is needed because unlike servers (where queryOption cannot be null because of timeout,etc), it can be null for brokers.

[vvivekiyer]

I'll update docs once this PR is merged.

[vvivekiyer]

Added query override option to docs.