poc for handling gboard hangul input

[skhugh]

What this PR does / why we need it?

This is an attempt to resolve hangul input issue by Gboard without using the pause/resume feature.
It is only a PoC, and codes should be refactored and made more stable if we end up using this resolution.

Any background context you want to provide?

What are the relevant tickets?

Fixes #

Checklist

• Added relevant tests or not required
• Didn't break anything

[codecov]

Codecov Report

Merging #91 (bb393e7) into main (a6cb0e8) will increase coverage by 0.08%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main      #91      +/-   ##
==========================================
+ Coverage   81.93%   82.01%   +0.08%     
==========================================
  Files          52       52              
  Lines        2397     2397              
  Branches      335      335              
==========================================
+ Hits         1964     1966       +2     
+ Misses        252      251       -1     
+ Partials      181      180       -1     

see 1 file with indirect coverage changes

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