stdlib: adds native hasher init procedure without padding

[hackaugusto]

Describe your changes

Adds a procedure to initialize the stack with the native hasher initial state. This only covers the case without the need for padding.

Related to https://github.com/0xPolygonMiden/miden-vm/issues/1311

Checklist before requesting a review

• Repo forked and branch created from next according to naming convention.
• Commit messages and codestyle follow conventions.
• Relevant issues are linked in the PR description.
• Tests added for new functionality.
• Documentation/comments updated according to changes.

[bobbinth]

Oh - one thing: could you also update the changelog?

[hackaugusto]

Oh - one thing: could you also update the changelog?

Added.

Btw, IMO we should add a PR template, and have a checklist in there. I personally always forget to add the changelog to everything. (either that or a CI check)