feat(Chat): Set default chatBehavior which uses Enter/Esc keys

[sophieH29]

Currently, we have implemented 2 chat behaviors:

• chatBehavior- uses ArrowRight and ArrowLeft to go in and out of the message
• chatEnterEscBehavior - uses Enter and Esc to go in and out of the message

After a couple of discussions, we agreed that default behavior should be the one that uses Enter and Esc.
Chat behavior which uses ArrowRight and ArrowLeft currently not needed, so it was removed from the repo.

[codecov]

Codecov Report

Merging #443 into master will decrease coverage by 0.02%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #443      +/-   ##
==========================================
- Coverage   91.82%   91.79%   -0.03%     
==========================================
  Files          41       41              
  Lines        1333     1329       -4     
  Branches      168      168              
==========================================
- Hits         1224     1220       -4     
  Misses        105      105              
  Partials        4        4

Impacted Files	Coverage Δ
src/index.ts	100% <ø> (ø)	⬆️

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[miroslavstastny]

Don't forget to update changelog