More list functions

[gaurav8297]

1. list_reverse_sort(list):
   Sorts the elements of the list in reverse order.

2. list_distinct(list):
   Removes all duplicates and NULLs from a list. Does
   not preserve the original order.

3. list_unique(list):
   Counts the unique elements of a list.

4. list_any_value(list):
   Returns the first non-null value in the list.

[codecov]

Codecov Report

Patch coverage: 94.27% and project coverage change: +0.02 🎉

Comparison is base (4f75391) 91.95% compared to head (ce7ed2e) 91.98%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1543      +/-   ##
==========================================
+ Coverage   91.95%   91.98%   +0.02%     
==========================================
  Files         689      696       +7     
  Lines       24672    24843     +171     
==========================================
+ Hits        22688    22852     +164     
- Misses       1984     1991       +7     

Impacted Files	Coverage Δ
src/include/function/list/vector_list_operations.h	97.36% <ø> (ø)
src/function/vector_list_operation.cpp	91.43% <92.93%> (+1.11%)	⬆️
...unction/list/operations/base_list_sort_operation.h	94.87% <94.87%> (ø)
src/function/built_in_vector_operations.cpp	96.11% <100.00%> (+0.09%)	⬆️
...unction/list/operations/list_any_value_operation.h	100.00% <100.00%> (ø)
...function/list/operations/list_distinct_operation.h	100.00% <100.00%> (ø)
...tion/list/operations/list_reverse_sort_operation.h	100.00% <100.00%> (ø)
...ude/function/list/operations/list_sort_operation.h	100.00% <100.00%> (+4.65%)	⬆️
...e/function/list/operations/list_unique_operation.h	100.00% <100.00%> (ø)

... and 31 files with indirect coverage changes

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