Follow numpy structure and add asv-specific README

[sfmig]

Description

What is this PR

• [ ] Bug fix
• [ ] Addition of a new feature
• [x] Other

Why is this PR needed?

What does this PR do?

• Modifies the asv benchmarks structure to one similar to numpy's and scipy's.
• Adds a benchmark specific readme with some more details on the usage.
• Reverts the workflows to use read_from_dask (until read_z_stack is added to the new release)
• After requested changes: removes [asv_version] as an "extra" for pip install.

References

Please reference any existing issues/PRs that relate to this PR.

How has this PR been tested?

Please explain how any new code has been tested, and how you have ensured that no existing functionality has changed.

Is this a breaking change?

If this PR breaks any existing functionality, please explain how and why.

Does this PR require an update to the documentation?

If any features have changed, or have been added. Please explain how the documentation has been updated (and link to the associated PR). See here for details.

Checklist:

• [x] The code has been tested locally
• [ n/a ] Tests have been added to cover all new functionality (unit & integration)
• [x] The documentation has been updated to reflect any changes
• [x] The code has been formatted with pre-commit

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 85.68%. Comparing base (8d5a0f5) to head (8484663).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #104 +/- ## ======================================= Coverage 85.68% 85.68% ======================================= Files 16 16 Lines 838 838 ======================================= Hits 718 718 Misses 120 120 ```

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