Added enum switch node

[nspielbau]

Fixes #33

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 27.65957% with 34 lines in your changes missing coverage. Please review.

Project coverage is 33.80%. Comparing base (adfad4a) to head (a2900ec).
Report is 2 commits behind head on dev.

Files	Patch %	Lines
ros_bt_py/ros_bt_py/nodes/fallback.py	27.65%	34 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              dev      #88      +/-   ##
==========================================
- Coverage   33.85%   33.80%   -0.06%     
==========================================
  Files          37       37              
  Lines        5461     5508      +47     
  Branches     1252     1267      +15     
==========================================
+ Hits         1849     1862      +13     
- Misses       3552     3586      +34     
  Partials       60       60              

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Test Results

 10 files  ±0   10 suites  ±0   27s ⏱️ ±0s
202 tests ±0  202 ✅ ±0  0 💤 ±0  0 ❌ ±0 
404 runs  ±0  404 ✅ ±0  0 💤 ±0  0 ❌ ±0 

Results for commit a2900ec. ± Comparison against base commit cf8dbda.

[Oberacda]

Can you please add tests for the node @nspielbau ?