[Proposal] Make able to write React in Typescript (#16210)

.eslintrc.js

app/javascript/hooks/useHovering.ts

app/javascript/mastodon/actions/picture_in_picture.js

app/javascript/mastodon/actions/streaming.js

app/javascript/mastodon/api.js

app/javascript/mastodon/components/avatar.jsx

app/javascript/mastodon/components/avatar.tsx

app/javascript/mastodon/components/blurhash.jsx

app/javascript/mastodon/components/common_counter.jsx

app/javascript/mastodon/components/hashtag.jsx

...vascript/mastodon/features/emoji/emoji_mart_data_light.js

...pt/mastodon/features/emoji/emoji_unicode_mapping_light.js

app/javascript/mastodon/initial_state.js

app/javascript/mastodon/is_mobile.js

app/javascript/mastodon/stream.js

app/javascript/mastodon/utils/notifications.js

app/javascript/mastodon/uuid.js

app/javascript/mastodon/uuid.ts

app/javascript/packs/public-path.js

app/javascript/types/resources.ts