allow rmarkdown engine

[clarkliming]

close #39

add a basic sas engine. it will be available on sasr load.

[clarkliming]

@benyamindsmith sorry for being so late, you can now try it our. and example can be found at https://github.com/insightsengineering/sasr/blob/39_allow_rmarkdown/inst/example.Rmd

[github-actions]

Code Coverage Summary

Filename          Stmts    Miss  Cover    Missing
--------------  -------  ------  -------  ------------
R/run_sas.R           6       0  100.00%
R/sas_engine.R        9       2  77.78%   7, 13
R/sascfg.R            8       8  0.00%    26-33
R/utils.R            66       7  89.39%   138-143, 164
R/zzz.R               4       4  0.00%    15-18
TOTAL                93      21  77.42%

Diff against main

Filename          Stmts    Miss  Cover
--------------  -------  ------  --------
R/sas_engine.R       +9      +2  +77.78%
R/zzz.R              +2      +2  +100.00%
TOTAL               +11      +4  -1.85%

Results for commit: d1c0ce8

Minimum allowed coverage is 80%

♻️ This comment has been updated with latest results

[github-actions]

Unit Test Performance Difference

Test Suite	$Status$	Time on main	$±Time$	$±Tests$	$±Skipped$	$±Failures$	$±Errors$
rmarkdown	👶		$+0.30$	$+1$	$+1$	$0$	$0$

Additional test case details

Test Suite	$Status$	Time on main	$±Time$	Test Case
rmarkdown	👶		$+0.30$	rmarkdown_engine_works

Results for commit 10c896e

♻️ This comment has been updated with latest results.

[github-actions]

Unit Tests Summary

 1 files   5 suites   0s ⏱️
16 tests 11 ✅ 5 💤 0 ❌
21 runs  15 ✅ 6 💤 0 ❌

Results for commit d1c0ce8.

♻️ This comment has been updated with latest results.