loader: add experimental text import

[efekrskl]

Closes #62082

Adds support for text import under --experimental-import-text flag.

Example:

import text from './file.txt' with { type: 'text' };

Import text is a Stage 3 TC39 proposal

Deno supports text imports with --unstable-raw-imports.
Bun supports text imports directly.

Not entirely sure what the current stance is on not-yet-landed proposals, but putting this up for discussion and feedback.

[nodejs-github-bot]

Review requested:

• @nodejs/config
• @nodejs/loaders

[bakkot]

Note that the import-bytes proposal requires producing Uint8Arrays backed by immutable ArrayBuffers, which are not yet supported in V8. I would be hesitant to ship this with mutable backing buffers, even flagged as experimental, lest people come to rely on that.

Text imports don't have the same problem.

[efekrskl]

Note that the import-bytes proposal requires producing Uint8Arrays backed by immutable ArrayBuffers, which are not yet supported in V8. I would be hesitant to ship this with mutable backing buffers, even flagged as experimental, lest people come to rely on that.

Text imports don't have the same problem.

That's a great point, looks like I've missed that. I've removed bytes related part of the code. Thank you!