Add CLA workflow

[walkowif]

Required for: https://github.com/insightsengineering/idr-tasks/issues/355

[github-actions]

🧪 Test coverage: 96.44%

Code Coverage Summary

Filename                     Stmts    Miss  Cover    Missing
-------------------------  -------  ------  -------  ------------------------------------------
R/ahr_estimation.R              23       0  100.00%
R/compare.R                     41       4  90.24%   42-45
R/elastic_net.R                 49       0  100.00%
R/generate_stacked_data.R       31       0  100.00%
R/hello.R                        2       0  100.00%
R/horseshoe.R                   76       0  100.00%
R/lOR_estimation.R              17       0  100.00%
R/naive.R                       55       0  100.00%
R/naivepop.R                    21       2  90.48%   34-35
R/plot.R                       138      14  89.86%   42-44, 65-68, 95-97, 141-142, 200-201, 209
R/preprocess.R                  39       0  100.00%
R/print.R                       12       0  100.00%
R/subgroups.R                   19       0  100.00%
R/summary.R                     92       3  96.74%   101, 122, 174
R/survival_curves.R              7       0  100.00%
R/test.R                         4       0  100.00%
R/trt_horseshoe.R               38       1  97.37%   48
src/surv_prob.cpp               10       0  100.00%
TOTAL                          674      24  96.44%

Diff against main

Filename      Stmts    Miss  Cover
----------  -------  ------  --------
TOTAL             0       0  +100.00%

Results for commit: 0146e0b

Minimum allowed coverage is 80%

♻️ This comment has been updated with latest results

[github-actions]

Unit Tests Summary

 1 files  18 suites   8m 39s ⏱️
39 tests 36 ✅ 3 💤 0 ❌
43 runs  39 ✅ 4 💤 0 ❌

Results for commit 0146e0b.

[github-actions]

Unit Test Performance Difference

Test Suite	$Status$	Time on main	$±Time$	$±Tests$	$±Skipped$	$±Failures$	$±Errors$
horseshoe	💔	$265.05$	$+198.52$	$0$	$0$	$0$	$0$

Additional test case details

Test Suite	$Status$	Time on main	$±Time$	Test Case
horseshoe	💔	$96.09$	$+99.12$	horseshoe_outputs_the_right_elements_for_binary
horseshoe	💔	$168.96$	$+99.40$	horseshoe_outputs_the_right_elements_for_survival

Results for commit d3c4aff

♻️ This comment has been updated with latest results.