Co-authored-by: Nacho Caballero <nacho.caballero@astrazeneca.com>

Add an example on how to write a tarfile to stdout; general improvements.

Co-authored-by: Adam Turner <9087854+AA-Turner@users.noreply.github.com>

…136762)

- Fix `hashlib_helper.block_algorithm` where the dummy functions were incorrectly defined.
- Rename `hashlib_helper.HashAPI` to `hashlib_helper.HashInfo` and add more helper methods.
- Simplify `hashlib_helper.requires_*()` functions.
- Rewrite some private helpers in `hashlib_helper`.
- Remove `find_{builtin,openssl}_hashdigest_constructor()` as they are no more needed and were
  not meant to be public in the first place.
- Fix some tests in `test_hashlib` when FIPS mode is on.

…ect (#136865)

Some internal helper functions taking the module object to retrieve its state
under some conditions now directly take the module's state instead as those
conditions hold most of the time.

…on (GH-136814)

Co-authored-by: blurb-it[bot] <43283697+blurb-it[bot]@users.noreply.github.com>
Co-authored-by: Petr Viktorin <encukou@gmail.com>

… and tarfile (GH-131470)

gh-91349: Adjust default compression level to 6 (down from 9) in gzip and tarfile

It is the default level used by most compression tools and a
better tradeoff between speed and performance.

Co-authored-by: rmorotti <romain.morotti@man.com>
Co-authored-by: Pieter Eendebak <pieter.eendebak@gmail.com>