refactor(loaddictionary): only accept arraybuffer

[kwonoj]

BREAKING CHANGE: loadDictionary does not read physical file from path anymore

This PR changes interface to loadDictionary to accept arrayBuffer only. Previously it also accepts physical path to dic / aff and read it, mount into wasm's memory space. For the preparation of electron's new async spellchecker, it is expected to create instance of provider in any context like worker, or renderer, vice versa - and detecting & supporting various env to load dictionary is non trivial job.

Any env should able to create arraybuffer from file contents instead - in main process fs can read file into buffer, and any other renderer process fetch or similar allows to retrieve contents from remote endpoint. Spellchecker provider now expects per-context handling occurs in caller's side.

[codecov]

Codecov Report

Merging #390 into feat-async will decrease coverage by 0.26%.
The diff coverage is 100%.

@@              Coverage Diff               @@
##           feat-async     #390      +/-   ##
==============================================
- Coverage        99.3%   99.03%   -0.27%     
==============================================
  Files               3        3              
  Lines             143      104      -39     
  Branches           25       16       -9     
==============================================
- Hits              142      103      -39     
  Partials            1        1

Impacted Files	Coverage Δ
src/spellCheckerProvider.ts	98.94% <100%> (-0.31%)	⬇️

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