add support for heatmap

[mhallal1]

part of insightsengineering/teal.modules.hermes#238
Add support for Heatmap class in PictureBlock to support pca module tmh.

[github-actions]

Code Coverage Summary

Filename              Stmts    Miss  Cover    Missing
------------------  -------  ------  -------  -------------------------------------------------------------------------
R/AddCardModule.R       100       3  97.00%   75-77
R/Archiver.R             25       0  100.00%
R/ContentBlock.R         16       0  100.00%
R/DownloadModule.R      161      40  75.16%   77-79, 100, 150-155, 164-168, 171-175, 183-187, 190-194, 201-205, 208-212
R/FileBlock.R            13       0  100.00%
R/NewpageBlock.R          2       0  100.00%
R/PictureBlock.R         30       1  96.67%   15
R/Previewer.R           217      11  94.93%   162, 164-167, 172-178
R/Renderer.R             54       4  92.59%   142, 144-145, 166
R/ReportCard.R           76       2  97.37%   211, 232
R/Reporter.R             96       1  98.96%   255
R/ResetModule.R          45       0  100.00%
R/SimpleReporter.R       18       0  100.00%
R/TableBlock.R            8       0  100.00%
R/TealReportCard.R       20       0  100.00%
R/TextBlock.R            13       0  100.00%
R/yaml_utils.R           74       2  97.30%   65, 263
TOTAL                   968      64  93.39%

Results for commit: 4171a6f

Minimum allowed coverage is 80%

♻️ This comment has been updated with latest results

[github-actions]

Unit Tests Summary

    1 files    17 suites   8s ⏱️
186 tests 186 ✔️ 0 💤 0 ❌
268 runs  268 ✔️ 0 💤 0 ❌

Results for commit 761a459.

[Polkas]

Please add some tests for it, the needed package could be in Suggests.

[Polkas]

As ComplexHeatmap::Heatmap demands a Bioc dependency so I think we could skip it or artificially return an object of its type.

[mhallal1]

replaced by #113