Testing framework: add ${count} to REPEAT

[rfdavid]

This PR adds ${count} to support using the count number to distinguish names. This might be useful to some use cases, for example, creating a node table with 2000 different columns:

-GROUP Test
-DATASET CSV empty

--

-CASE Dummy

-DEFINE COLS REPEAT 2000 "Col${count} STRING, "
-STATEMENT CREATE NODE TABLE Person(${COLS} PRIMARY KEY(Col0))
---- ok

closes #1729

[codecov]

Codecov Report

Patch coverage: 99.25% and no project coverage change.

Comparison is base (8f029ed) 91.39% compared to head (5851a38) 91.39%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1733   +/-   ##
=======================================
  Coverage   91.39%   91.39%           
=======================================
  Files         759      760    +1     
  Lines       27416    27432   +16     
=======================================
+ Hits        25056    25071   +15     
- Misses       2360     2361    +1     

Impacted Files	Coverage Δ
src/include/binder/binder.h	100.00% <ø> (ø)
src/include/common/statement_type.h	100.00% <ø> (ø)
src/include/parser/transformer.h	100.00% <ø> (ø)
src/include/planner/join_order_enumerator.h	100.00% <ø> (ø)
...ical_plan/logical_operator/base_logical_operator.h	100.00% <ø> (ø)
src/include/planner/query_planner.h	100.00% <ø> (ø)
src/include/processor/mapper/plan_mapper.h	100.00% <ø> (ø)
src/include/processor/operator/physical_operator.h	100.00% <ø> (ø)
src/processor/processor.cpp	100.00% <ø> (ø)
src/planner/operator/base_logical_operator.cpp	72.05% <50.00%> (ø)
... and 24 more

... and 1 file with indirect coverage changes

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[acquamarin]

Can you rebase the master and refactor the NodeTableWith300ColumnsInfo test using the new testing statement?