RustAdvancedLoggerDxe: Remove spinlocks, add function!(), add std feature.

[joschock]

Description

This PR implements 3 enhancements for the RustAdvancedLoggerDxe driver:

• Removes spinlocks altogether. State that used to be shared (in particular, the current log level while generating a multi-part log message) is now on the stack.
• Add function!() macro that returns the current function name as a static string.
• Add std feture that maps debug!() and by extension debugln!() macros to std::println;

• Impacts functionality?
• Impacts security?
• Breaking change?
• Includes tests?
  • Existing unit tests updated to accommodate new design.
• Includes documentation?
  • Existing docs updated to accommodate new design.

How This Was Tested

Unit tests pass, new features validated in both unit test environment (std feature active and mapping to std::print) and qemu UEFI boot (std feature not active, using AdvLogger protocol).

Integration Instructions

N/A - existing code should function as-is. New code that wants to take advantage of std can activate it for tests by specifying it as a feature for RustAdvLoggerDxe in dev-dependencies:

[dev-dependencies]
RustAdvancedLoggerDxe = {workspace=true, features=["std"]}

[makubacki]

Will review on Monday.

[makubacki]

@joschock, I thought this PR was going for a rebase to preserve the commits. If this the case, can you please drop the merge commit that's present?

There's a stack cookie breaking change rippling through the repos (impacting build at the moment). This can go in after that's done.

[joschock]

@joschock, I thought this PR was going for a rebase to preserve the commits. If this the case, can you please drop the merge commit that's present?

There's a stack cookie breaking change rippling through the repos (impacting build at the moment). This can go in after that's done.

Thanks - yes that's right, clicked the merge out of habit. Reverted.