Support ValueWindowFunction for LEAD/LAG/FIRST_VALUE/LAST_VALUE

[xiangfu0]

Support ValueWindowFunction for LEAD/LAG/FIRST_VALUE/LAST_VALUE.
Sample query from QuickStart:

SELECT city, billingMonth, sumPrecision(baseUsage) as totalUsage,
LAG(sumPrecision(baseUsage)) OVER (PARTITION BY city ORDER BY billingMonth) AS previous_month_usage, 
LEAD(sumPrecision(baseUsage)) OVER (PARTITION BY city ORDER BY billingMonth) AS next_month_usage
FROM billing
GROUP BY city, billingMonth
ORDER BY city, billingMonth

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 68 lines in your changes are missing coverage. Please review.

Project coverage is 27.78%. Comparing base (59551e4) to head (8197c40).
Report is 258 commits behind head on master.

Files	Patch %	Lines
...uery/runtime/operator/WindowAggregateOperator.java	0.00%	21 Missing ⚠️
...y/runtime/operator/window/ValueWindowFunction.java	0.00%	14 Missing ⚠️
...untime/operator/window/LagValueWindowFunction.java	0.00%	10 Missing ⚠️
...ntime/operator/window/LeadValueWindowFunction.java	0.00%	10 Missing ⚠️
...time/operator/window/FirstValueWindowFunction.java	0.00%	6 Missing ⚠️
...ntime/operator/window/LastValueWindowFunction.java	0.00%	6 Missing ⚠️
...query/runtime/operator/utils/AggregationUtils.java	0.00%	1 Missing ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##             master   #12878       +/-   ##
=============================================
- Coverage     61.75%   27.78%   -33.97%     
+ Complexity      207      198        -9     
=============================================
  Files          2436     2502       +66     
  Lines        133233   136415     +3182     
  Branches      20636    21107      +471     
=============================================
- Hits          82274    37900    -44374     
- Misses        44911    95620    +50709     
+ Partials       6048     2895     -3153     

Flag	Coverage Δ
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unittests1	?
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[npawar]

@xiangfu0 have docs been updated?