Filter warning for speasy import and remove unused providers

[jgieseler]

This pull request introduces improvements to how the speasy library is imported in several modules. The main goal is to suppress unnecessary warnings and speed up the import process by disabling unused data providers. The changes also ensure that warnings about non-compliant ISTP files from speasy are ignored, resulting in cleaner logs and improved performance.

Improvements to speasy import and warning handling:

• Disabled unused speasy data providers (sscweb, archive, csa) before importing speasy in multi_inst_plots/psp_tools.py, multi_inst_plots/solo_tools.py, and spatial_analysis/__init__.py to speed up the import process. [1] [2] [3]
• Suppressed UserWarning messages about "Non compliant ISTP file" from speasy using a context manager with warnings.catch_warnings() in all affected modules, ensuring cleaner output. [1] [2] [3]

Code cleanup:

• Removed redundant direct import of speasy in spatial_analysis/__init__.py and moved it into the new import block with warning suppression and provider disabling. [1] [2]
• Added missing import warnings in multi_inst_plots/solo_tools.py to support the new warning suppression logic.