Make the CRC Platform Abstraction Layer multi-context-safe

[parmi93]

• Introduces stse_crc16_context_t struct context.
• Introduces stse_platform_Crc16_ContextInit() and stse_platform_Crc16_ContextRelease() PAL APIs.
• Refactors stse_platform_Crc16_Accumulate() PAL API.
• Removes stse_platform_Crc16_Calculate() PAL API.

These changes resolve issue #65 by allowing users to adapt the CRC16 PAL implementation to scenarios where communication with multiple STSAFE devices takes place concurrently.

Additionally, they make it possible to implement thread-safe CRC16 PAL APIs when CRC computation is performed by a shared hardware peripheral. This ensures that concurrent access from multiple threads can be managed safely, even when those threads are not necessarily communicating with different STSAFE devices.

[parmi93]

I just realized that this PR targets the main branch instead of dev/1.2.0. I can't find an option to change the target branch on my side, so hopefully one of the maintainers has the necessary permissions to update it.

[TofMassilia13320]

Tx to solve conflicts.
I see:

• multiple crc init
• stse_platform_Crc16_Calculate presence

[parmi93]

Fix the conflicts by rebasing my branch (dev/1.2.0) with the upstream/dev/1.2.0 branch, and I push forced to keep the git history clean.