add `is_periodic` keyword argument to standard `MeshData`

[jlchan]

This does not yet include any "experimental" meshes (e.g., hybrid, cut-cell, non-conforming).

[codecov[bot]]

Codecov Report

Merging #141 (263f29f) into main (84c19c0) will increase coverage by 0.29%. The diff coverage is 95.00%.

@@            Coverage Diff             @@
##             main     #141      +/-   ##
==========================================
+ Coverage   97.44%   97.74%   +0.29%     
==========================================
  Files          25       25              
  Lines        3018     3018              
==========================================
+ Hits         2941     2950       +9     
+ Misses         77       68       -9     

Impacted Files	Coverage Δ
src/connectivity_functions.jl	98.09% <ø> (+3.24%)	:arrow_up:
src/MeshData.jl	95.36% <95.00%> (+0.22%)	:arrow_up:

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