Adds macros for creating WindowUDF and WindowFunction expression (a…

…pache#12693)

* Adds macro for udwf singleton

* Adds a doc comment parameter to macro

* Add doc comment for `create_udwf` macro

* Uses default constructor

* Update `Cargo.lock` in `datafusion-cli`

* Fixes: expand `$FN_NAME` in doc strings

* Adds example for macro usage

* Renames macro

* Improve doc comments

* Rename udwf macro

* Minor: doc copy edits

* Adds macro for creating fluent-style expression API

* Adds support for 1 or more parameters in expression function

* Rewrite doc comments

* Rename parameters

* Minor: formatting

* Adds doc comment for `create_udwf_expr` macro

* Improve example docs

* Hides extraneous code in doc comments

* Add a one-line readme

* Adds doc test assertions + minor formatting fixes

* Adds common macro for defining user-defined window functions

* Adds doc comment for `define_udwf_and_expr`

* Defines `RowNumber` using common macro

* Add usage example for common macro

* Adds usage for custom constructor

* Add examples for remaining patterns

* Improve doc comments for usage examples

* Rewrite inner line docs

* Rewrite `create_udwf_expr!` doc comments

* Minor doc improvements

* Fix doc test and usage example

* Add inline comments for macro patterns

* Minor: change doc comment in example