Support aggregate window functions

[dai-chen]

Issue #, if available: #770

Description of changes:

To reviewers, most file changes are due to 1 and 2a renaming. You can focus on core logic in PeerRowsWindowFrame and AggregateWindowFunction.

1. Use NamedExpression in logical and physical window operator: this is required because after expression analysis window function lost info in OVER clause, ex. RANK() OVER(expr1), RANK(expr2)
2. Refactor window frame
   a. Rename existing frame to CurrentRowWindowFrame which only maintains current row (and previous) for ranking window functions.
   b. Add new PeerRowsWindowFrame which preloads all peer rows for aggregate window function (Please check the design doc for more details)
3. Add AggregateWindowFunction adapter class to reuse existing aggregator

Documentation:

1. Design doc: https://github.com/dai-chen/sql/blob/support-aggregate-window-functions-2/docs/dev/AggregateWindowFunction.md
2. User manual: https://github.com/dai-chen/sql/blob/support-aggregate-window-functions-2/docs/user/dql/window.rst#aggregate-functions
3. Limitations: https://github.com/dai-chen/sql/blob/support-aggregate-window-functions-2/docs/user/limitations/limitations.rst#limitations-on-window-functions

TODOs: (covered in limitation doc)

1. Optimize reference to other expression in SELECT clause, ex. SELECT SUM(a), SUM(SUM(a)) OVER(...) ...
2. [Low] window function nested in other expression, ex. CASE WHEN SUM(a) OVER(...) ...
3. Enable circuit break for window operator in case of worst case happen (elaborated in design doc above).

Testing: Added UT and comparison test.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[codecov]

Codecov Report

Merging #946 (59c7582) into develop (280482c) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             develop     #946   +/-   ##
==========================================
  Coverage      99.87%   99.87%           
- Complexity      2350     2381   +31     
==========================================
  Files            232      234    +2     
  Lines           5413     5477   +64     
  Branches         349      357    +8     
==========================================
+ Hits            5406     5470   +64     
  Misses             5        5           
  Partials           2        2           

Impacted Files	Coverage Δ	Complexity Δ
...l/expression/window/ranking/DenseRankFunction.java	100.00% <ø> (ø)	4.00 <0.00> (ø)
...ch/sql/expression/window/ranking/RankFunction.java	100.00% <ø> (ø)	4.00 <0.00> (ø)
...l/expression/window/ranking/RowNumberFunction.java	100.00% <ø> (ø)	3.00 <0.00> (ø)
...sticsearch/sql/planner/logical/LogicalPlanDSL.java	100.00% <ø> (ø)	16.00 <0.00> (ø)
...asticsearch/sql/planner/logical/LogicalWindow.java	100.00% <ø> (ø)	2.00 <0.00> (ø)
...icsearch/sql/planner/physical/PhysicalPlanDSL.java	100.00% <ø> (ø)	15.00 <0.00> (ø)
...rch/sql/sql/parser/context/QuerySpecification.java	100.00% <ø> (ø)	15.00 <0.00> (ø)
...elasticsearch/sql/analysis/ExpressionAnalyzer.java	100.00% <100.00%> (ø)	33.00 <2.00> (+1.00)
...rch/sql/analysis/ExpressionReferenceOptimizer.java	100.00% <100.00%> (ø)	14.00 <2.00> (+2.00)
...csearch/sql/analysis/SelectExpressionAnalyzer.java	100.00% <100.00%> (ø)	9.00 <0.00> (ø)
... and 10 more

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