Shared channel trigger events have optional `channel_ids`

[WilliamBergamin]

Summary

This PR sets the channel_ids field of the shared_channel_invite_* event triggers as optional.

Before

TS error would appear

After

NOTE: Can't think of a good way to test this since there is no strong type inference

Requirements (place an x in each [ ])

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

[codecov[bot]]

Codecov Report

Merging #70 (7f52e37) into main (2e61dc0) will not change coverage. The diff coverage is n/a.

@@            Coverage Diff            @@
##              main       #70   +/-   ##
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  Coverage   100.00%   100.00%           
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  Files            6         6           
  Lines          141       141           
  Branches         9         9           
=========================================
  Hits           141       141           

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