feat(import): Add TXT file format to assets

[boehs]

Description

There is no reason a .txt would not be an asset :)

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What is the purpose of this pull request?

• Bug fix
• New Feature
• Documentation update
• Other

Before submitting the PR, please make sure you do the following

• Read the Contributing Guidelines.
• Read the Pull Request Guidelines and follow the Commit Convention.
• Check that there isn't already a PR that solves the problem the same way to avoid creating a duplicate.
• Provide a description in this PR that addresses what the PR is solving, or reference the issue that it solves (e.g. fixes #123).
• Ideally, include relevant tests that fail without this PR but pass with it.

[patak-dev]

LGTM, but let's check this one in the next meeting, we wanted to avoid adding too many formats.

[patak-dev]

We talked about the PR, and we can merge it. @boehs would you update packages/vite/client.d.ts as it is indicated in the comment about that enum? See

vite/packages/vite/src/node/constants.ts

Line 55 in 1780700

// ** READ THIS ** before editing `KNOWN_ASSET_TYPES`.

[patak-dev]

See comment