Add celltypes option to heatmap

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (51a576c) 97.27% compared to head (ea130dc) 97.32%.

:exclamation: Current head ea130dc differs from pull request most recent head 936f89f. Consider uploading reports for the commit 936f89f to get more accurate results

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #58 +/- ## ========================================== + Coverage 97.27% 97.32% +0.05% ========================================== Files 7 7 Lines 660 673 +13 ========================================== + Hits 642 655 +13 Misses 18 18 ``` | [Flag](https://app.codecov.io/gh/zktuong/ktplotspy/pull/58/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Zewen+Kelvin+Tuong) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/zktuong/ktplotspy/pull/58/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Zewen+Kelvin+Tuong) | `97.32% <100.00%> (+0.05%)` | :arrow_up: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Zewen+Kelvin+Tuong#carryforward-flags-in-the-pull-request-comment) to find out more. | [Files](https://app.codecov.io/gh/zktuong/ktplotspy/pull/58?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Zewen+Kelvin+Tuong) | Coverage Δ | | |---|---|---| | [ktplotspy/plot/plot\_cpdb\_heatmap.py](https://app.codecov.io/gh/zktuong/ktplotspy/pull/58?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Zewen+Kelvin+Tuong#diff-a3RwbG90c3B5L3Bsb3QvcGxvdF9jcGRiX2hlYXRtYXAucHk=) | `93.65% <100.00%> (+1.65%)` | :arrow_up: |

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