Implementation for getting data for import csv

[krmanik]

Pull Request template

Purpose / Description

New Import CSV UI will be used for importing csv/tsv file. So, getNotetypeNamesRaw, getDeckNamesRaw, and getCsvMetadataRaw needed in V16 backend (newBackend).

Fixes

Fixes Link to the issues.

Approach

For each backend function wrapped in function with input of type ByteArray and return type of ByteArray.

How Has This Been Tested?

No test added for it but I have tested locally using this PR krmanik#23

Learning (optional, can help others)

krmanik#23

Checklist

Please, go through these checks before submitting the PR.

• You have not changed whitespace unnecessarily (it makes diffs hard to read)
• You have a descriptive commit message with a short title (first line, max 50 chars).
• Your code follows the style of the project (e.g. never omit braces in if statements)
• You have commented your code, particularly in hard-to-understand areas
• You have performed a self-review of your own code
• UI changes: include screenshots of all affected screens (in particular showing any new or changed strings)
• UI Changes: You have tested your change using the Google Accessibility Scanner

[krmanik]

More methods need to add, when submit button click then data sent to backend, so need implementation. Needs improvement.

[github-actions]

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