Add Seek instance for std::io::Take

[wangbj]

Library tracking issue #97227.

Previous PR: #97230
I made a mistake (I'm a git noob) by using merge commits which is not allowed in PR. hence creating a new PR will close the old one.

Change summary:

• Track current cursor position in std::io::Take.
• Add impl Seek for std::io::Take.
• Because .take(N) can return less data than N, we also call an initial seek to determine how many bytes are available. This is done in the seek function and it is called only once.

[rust-highfive]

Hey! It looks like you've submitted a new PR for the library teams!

If this PR contains changes to any rust-lang/rust public library APIs then please comment with r? rust-lang/libs-api @rustbot label +T-libs-api -T-libs to request review from a libs-api team reviewer. If you're unsure where your change falls no worries, just leave it as is and the reviewer will take a look and make a decision to forward on if necessary.

Examples of T-libs-api changes:

• Stabilizing library features
• Introducing insta-stable changes such as new implementations of existing stable traits on existing stable types
• Introducing new or changing existing unstable library APIs (excluding permanently unstable features / features without a tracking issue)
• Changing public documentation in ways that create new stability guarantees
• Changing observable runtime behavior of library APIs

[rust-highfive]

Thanks for the pull request, and welcome! The Rust team is excited to review your changes, and you should hear from @joshtriplett (or someone else) soon.

Please see the contribution instructions for more information.

[compiler-errors]

r? rust-lang/libs-api
@rustbot label +T-libs-api -T-libs

[bors]

☔ The latest upstream changes (presumably #99707) made this pull request unmergeable. Please resolve the merge conflicts.

[anden3]

Hello @wangbj! I noticed this PR has a merge conflict, has there been any updates?

[Dylan-DPC]

Closing the pr as inactive. Feel free to create a new pr or reöpen this if you plan on continuing with it.