Hardcore weight txt path

[vloncar]

Description

Currently, weight loading requires running from the specific directory so the relative paths match. In addition, predict() expects all backbends to have a format of <output_dir>/firmware which may not be the case forever in the future (one API in particular will have a different hierarchy). With this PR we ensure the created .so file is has the weights for in absolute path, so loading it from any directory will work, and predict no longer has to change folders.

Type of change

• [x] New feature (non-breaking change which adds functionality)
• [x] Breaking change (fix or feature that would cause existing functionality to not work as expected)

Tests

No need for new tests, all tests will fail if it doesn't work.

Checklist

• [x] I have read the guidelines for contributing.
• [x] I have commented my code, particularly in hard-to-understand areas.
• [x] I have made corresponding changes to the documentation.
• [x] My changes generate no new warnings.
• [x] I have installed and run pre-commit on the files I edited or added.
• [x] I have added tests that prove my fix is effective or that my feature works.