Add Emojis by Account

[meronmks]

entity.AccountにEmojisが無く、display_nameにカスタム絵文字が存在すると画像が参照出来ないので追加しました。entity.Emojiのvisible_in_pickerは実際にAPIを叩いたときに帰ってくるJSONのデータに対して不足していたので追加しました。

[codecov-io]

Codecov Report

Merging #65 into master will decrease coverage by 0.01%.
The diff coverage is 0%.

@@             Coverage Diff              @@
##             master      #65      +/-   ##
============================================
- Coverage     54.25%   54.23%   -0.02%     
- Complexity      147      148       +1     
============================================
  Files            44       44              
  Lines           800      802       +2     
  Branches         80       80              
============================================
+ Hits            434      435       +1     
- Misses          352      353       +1     
  Partials         14       14

Impacted Files	Coverage Δ	Complexity Δ
...n/java/com/sys1yagi/mastodon4j/api/entity/Emoji.kt	20% <0%> (+20%)	1 <0> (+1)	⬆️
...java/com/sys1yagi/mastodon4j/api/entity/Account.kt	33.33% <0%> (-2.39%)	5 <0> (ø)

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