Fix #757 Add event type name validation & channel_type filter middleware

[seratch]

Summary

This pull request fixes #757 - refer to the issue for details.

Requirements (place an x in each [ ])

• I've read and understood the Contributing Guidelines and have done my best effort to follow them.
• I've read and agree to the Code of Conduct.

[codecov]

Codecov Report

Merging #857 (d9b666f) into main (afcd7bd) will increase coverage by 0.17%.
The diff coverage is 88.88%.

❗ Current head d9b666f differs from pull request most recent head 62a14e5. Consider uploading reports for the commit 62a14e5 to get more accurate results

@@            Coverage Diff             @@
##             main     #857      +/-   ##
==========================================
+ Coverage   65.98%   66.16%   +0.17%     
==========================================
  Files          13       13              
  Lines        1176     1185       +9     
  Branches      344      347       +3     
==========================================
+ Hits          776      784       +8     
  Misses        334      334              
- Partials       66       67       +1     

Impacted Files	Coverage Δ
src/App.ts	83.77% <88.88%> (+0.13%)	⬆️

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