Add summary_maps function

[jeekinlau]

here is new function... but dont know if we should rename function to a different name to not confuse with mappoly::summary_maps

[codecov-commenter]

Codecov Report

Patch coverage has no change and project coverage change: -0.15 ⚠️

Comparison is base (522637a) 56.73% compared to head (901556e) 56.58%.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main      #67      +/-   ##
==========================================
- Coverage   56.73%   56.58%   -0.15%     
==========================================
  Files          59       60       +1     
  Lines        7361     7378      +17     
==========================================
- Hits         4176     4175       -1     
- Misses       3185     3203      +18     

Impacted Files	Coverage Δ
R/summary_maps.R	0.00% <0.00%> (ø)

... and 1 file with indirect coverage changes

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