Add rowwise for SpatVectors

[dieghernan]

Closes #88

cc: @rhijmans

[codecov]

Codecov Report

Patch coverage: 95.34% and project coverage change: -0.17 ⚠️

Comparison is base (ae9b2ed) 99.44% compared to head (ce6edb1) 99.28%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #92      +/-   ##
==========================================
- Coverage   99.44%   99.28%   -0.17%     
==========================================
  Files          42       43       +1     
  Lines        2172     2234      +62     
==========================================
+ Hits         2160     2218      +58     
- Misses         12       16       +4     

Impacted Files	Coverage Δ
R/as_spatvector.R	97.56% <71.42%> (-2.44%)	⬇️
R/as_tibble-Spat.R	98.58% <96.22%> (-1.42%)	⬇️
R/as_sf.R	100.00% <100.00%> (ø)
R/group-by-SpatVector.R	95.83% <100.00%> (+0.83%)	⬆️
R/group-data-SpatVector.R	100.00% <100.00%> (ø)
R/rowwise-SpatVector.R	100.00% <100.00%> (ø)
R/summarise-SpatVector.R	100.00% <100.00%> (ø)

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