fix nested tidy function call indentation

[AshesITR]

Fixes #1898

Works by adding a new indent_type "suppress", which allows XPaths to detect indentation changes that should be suppressed for the specified style.

In the particular case we suppress indent changes from parentheses that start on the same line as their enclosed expr and where the enclosed expr has only one child on the final line (namely its closing parenthesis).

[codecov-commenter]

Codecov Report

Merging #1948 (2ef0746) into main (c6099d5) will increase coverage by 0.00%.
The diff coverage is 100.00%.

❗ Current head 2ef0746 differs from pull request most recent head 9f252da. Consider uploading reports for the commit 9f252da to get more accurate results

@@           Coverage Diff           @@
##             main    #1948   +/-   ##
=======================================
  Coverage   98.95%   98.95%           
=======================================
  Files         113      113           
  Lines        4953     4965   +12     
=======================================
+ Hits         4901     4913   +12     
  Misses         52       52           

Impacted Files	Coverage Δ
R/indentation_linter.R	100.00% <100.00%> (ø)

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[AshesITR]

@IndrajeetPatil PTAL if this is an acceptable solution.

[IndrajeetPatil]

Thanks! 🙌