cofacts / rumors-line-bot / 7465466044

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Handle submitting multiple messages (cooccurrences) at once (#379)

## Feature

This PR implements the items with yellow highlight.
We should probably ignore Items with red highlight in the future.
<img src="https://docs.google.com/drawings/d/e/2PACX-1vQszlkE2JfgpnoLVfYIcOiL5nFjH60XYxO-vdQ9ECvttvRHNJJCTbONcITcCl9dZY97-nbcMLq6_HE8/pub?w=1696&amp;h=998">

Implement `askingCooccurrences` handler and connect to `processBatch`
- Design doc: https://g0v.hackmd.io/@cofacts/rd/%2Ff_Ze19PhQuqx_fzOAOkohQ
- `processBatch` asks if messages were sent together by the same person
- `askingCooccurrences` handler handles the user's response.
- Includes translation
- No tests yet

## Refactors

Change `askingArticleSubmissionConsent`'s input from Yes/No to an array of index
- ranges from 0 ~ context.msgs.length - 1
- indicates the `context.msgs` that does not in DB and is asking for user's consent for submission
- If the user rejects, input of `askingArticleSubmissionConsent` is an empty array
- updates snapshots of action inputs and related logic

Revamp logic of `askingArticleSubmissionConsent`
- Before this PR, the handler only processes the first message in `context.msgs`
- The new logic would 
    1. submits multiple messages to database according to the input
    2. create `UserArticleLink` for newly created messages
        - For existing messages, the user article link will be created when the user selects the message in search results
    3. if multiple messages, set cooccurrences and show search results; otherwise, show creation results

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