Prepare release v0.31.1

[erwanor]

Prepare v0.31.1 to expose TypedEvent as intented in #1288.

• Referenced an issue explaining the need for the change
• Updated all relevant documentation in docs
• Updated all code comments where relevant
• Wrote tests
• Added entry in .changelog/

[codecov-commenter]

Codecov Report

Merging #1298 (67c88cc) into main (ffbf990) will decrease coverage by 0.1%.
The diff coverage is n/a.

❗ Current head 67c88cc differs from pull request most recent head 5a6c58c. Consider uploading reports for the commit 5a6c58c to get more accurate results

@@           Coverage Diff           @@
##            main   #1298     +/-   ##
=======================================
- Coverage   64.2%   64.2%   -0.1%     
=======================================
  Files        271     271             
  Lines      24450   24450             
=======================================
- Hits       15720   15719      -1     
- Misses      8730    8731      +1     

see 2 files with indirect coverage changes

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[hdevalence]

I realized I didn't commit the .changelog entries from 0.31.0, so I rebased and folded them into that commit, and updated the docs in 5a6c58c

[thanethomson]

- - Expose the `tendermint::abci::event::TypedEvent
+ - Expose the `tendermint::abci::event::TypedEvent`

[thanethomson]

We usually have dates associated with releases.

[erwanor]

I checked the other summary.mds and they don't seem to have a date attached to it, what am i missing?

[thanethomson]

The last time a date was applied was v0.29.0

[thanethomson]

Link to PR/issue?

[thanethomson]

Also missing a release date here.