Fix/cran checks

[GFabien]

• Condition testing of snapshots on the presence of the environment variable TEST_SNAPSHOTS.
• Remove LaTeX command \text.
• Rename classes "cval", "permutation", "bootstrap", and "stability" into "rgcca_cv", "rgcca_permutation", "rgcca_bootstrap", and "rgcca_stability".
• Merge documentation of print and plot functions into a single documentation page.

[codecov-commenter]

Codecov Report

Merging #73 (c8a317a) into main (8bdc412) will increase coverage by 0.01%. The diff coverage is 100.00%.

:exclamation: Current head c8a317a differs from pull request most recent head 83d1069. Consider uploading reports for the commit 83d1069 to get more accurate results

:exclamation: Your organization is not using the GitHub App Integration. As a result you may experience degraded service beginning May 15th. Please install the Github App Integration for your organization. Read more.

@@            Coverage Diff             @@
##             main      #73      +/-   ##
==========================================
+ Coverage   94.61%   94.62%   +0.01%     
==========================================
  Files          78       78              
  Lines        3267     3274       +7     
==========================================
+ Hits         3091     3098       +7     
  Misses        176      176              

Impacted Files	Coverage Δ
R/plot.rgcca.R	95.87% <ø> (ø)
R/print.rgcca.R	100.00% <ø> (ø)
R/rgcca.R	89.47% <ø> (ø)
R/get_rgcca_args.R	95.00% <100.00%> (ø)
R/plot.rgcca_bootstrap.r	97.43% <100.00%> (ø)
R/plot.rgcca_cv.R	100.00% <100.00%> (ø)
R/plot.rgcca_permutation.R	100.00% <100.00%> (ø)
R/plot.rgcca_stability.R	100.00% <100.00%> (ø)
R/print.rgcca_bootstrap.r	87.50% <100.00%> (ø)
R/print.rgcca_cv.r	100.00% <100.00%> (ø)
... and 6 more