CRAN updates and clean

[mattsecrest]

• [] clean up and prepare for CRAN submission
• [] QC vignettes and look for consistency and clarify

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 21.21212% with 26 lines in your changes are missing coverage. Please review.

Project coverage is 79.23%. Comparing base (cbef176) to head (6fcd173).

:exclamation: Current head 6fcd173 differs from pull request most recent head add107e. Consider uploading reports for the commit add107e to get more accurate results

Files	Patch %	Lines
R/simulation_class.R	0.00%	15 Missing :warning:
R/mcmc_sample.R	0.00%	7 Missing :warning:
R/analysis_class.R	0.00%	3 Missing :warning:
R/generics.R	0.00%	1 Missing :warning:

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #271 +/- ## ========================================== - Coverage 80.47% 79.23% -1.25% ========================================== Files 60 60 Lines 1588 1613 +25 ========================================== Hits 1278 1278 - Misses 310 335 +25 ```

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[mattsecrest]

Getting an error on winbuilder 00check.log.txt

[gravesti]

@mattsecrest I think I've fixed the failing test and the note about the URLs. I've uploaded again to winbuilder

[mattsecrest]

• [x] load library(cmdstanr) in vignettes
• [x] throw errors for cmdstanr stuff
• [x] getter for stan models

[mattsecrest]

@gravesti good catch on the (x) functionality. Anything else before we submit? I figure we can build and submit from this branch then merge when accepted?