Update setup configurations

[luizgabrielsilva]

Modifications

• Add pyproject.toml and remove setup.py (PyPA specifications);
• Update dependencies;
• Update references to the package inside the modules
• Remove lazy imports from tests and implement general style corrections (flake8)

Notes:

• Code inside core modules were not modified;
• There are two tests currently failing (apparently not due to the updates);
• Two test functions were commented because they were redefining previous test functions;
• Notebook TimeMetrics in the folder example contains depends on a package not installed during setup (stac). It is in the dependency tree.

[andersonreisoares]

Looks, good for me. Thank you, @luizgabrielsilva !

[andersonreisoares]

@raphaelrpl , @marujore I'm not able to accept this pull request. The changes looks ok for me. It any of you have the privileges to merge, I'm ok.

This request closes https://github.com/brazil-data-cube/stmetrics/issues/15

[marujore]

@raphaelrpl , @marujore I'm not able to accept this pull request. The changes looks ok for me. It any of you have the privileges to merge, I'm ok.

This request closes #15

@andersonreisoares Sorry about that. Your previleges have been updated, please test it now.