implement parser with TypeScript

[marihachi]

What

Related to #92

とりあえずはcanaryへのマージ。 問題なさそうならdevelopに入れる予定。

Why

Additional info (optional)

[codecov[bot]]

Codecov Report

Merging #116 (cd016a6) into canary (7b7af90) will decrease coverage by 1.65%. The diff coverage is 97.19%.

@@            Coverage Diff             @@
##           canary     #116      +/-   ##
==========================================
- Coverage   99.63%   97.98%   -1.66%     
==========================================
  Files           4        8       +4     
  Lines         553     1540     +987     
  Branches      110      316     +206     
==========================================
+ Hits          551     1509     +958     
- Misses          1       29      +28     
- Partials        1        2       +1     

Impacted Files	Coverage Δ
src/@types/twemoji.d.ts	0.00% <0.00%> (ø)
src/internal/util.ts	97.67% <77.77%> (-1.34%)	:arrow_down:
src/internal/core/index.ts	92.56% <92.56%> (ø)
src/internal/parser.ts	99.33% <99.33%> (ø)
src/api.ts	100.00% <100.00%> (ø)
src/internal/index.ts	100.00% <100.00%> (ø)

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[syuilo]

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