Replace log crate with tracing in host code

[Copilot]

Plan: Replace log crate with tracing - ✅ COMPLETE

• Explore the repository structure and understand current logging usage
• Identify all files using the log crate
• Replace log imports with tracing equivalents in source files:
  • hyperlight_common - Updated to use tracing::Level
  • hyperlight_host - All log macros replaced with tracing
  • hyperlight_component_util - Updated to use tracing::debug
  • ✅ hyperlight_guest_bin - Keeps log for guest bridge (intentional - correct)
  • ✅ hyperlight_testing - Keeps log for test bridge (intentional - correct)
  • ✅ hyperlight_guest_capi - Keeps log for guest bridge (intentional - correct)
  • ✅ Test guests - Keep log for compatibility (intentional - correct)
• Update Cargo.toml dependencies
• Update logging macro calls
• Handle type conversions (Level, LevelFilter)
• Update internal macros
• Fix test code compatibility
• Remove redundant parent = Span::current() from instrument attributes (it's the default)
• Test the changes:
  • Build hyperlight-host ✓
  • Build with tests ✓
  • Run clippy on changed packages ✓
  • Test hyperlight-common ✓
• Run fmt ✓

Summary of Changes

Replaced in host code:

• log::error! → tracing::error!
• log::warn! → tracing::warn!
• log::info! → tracing::info!
• log::debug! → tracing::debug!
• log::trace! → tracing::trace!
• log::Level → tracing::Level with correct constants (TRACE, DEBUG, INFO, WARN, ERROR)
• Removed redundant parent = Span::current() from all instrument attributes

Intentionally kept log crate in:

• Guest code (hyperlight_guest_bin, hyperlight_guest_capi)
• Test infrastructure (hyperlight_testing)
• Test guests (simpleguest, etc.)

This is correct because guest code implements log::Log trait for the host-guest logging bridge.

Original prompt

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This section details on the original issue you should resolve

<issue_title>Use tracing crate instead of log to create logs</issue_title>
<issue_description>We are currently using both the tracing and log crate to emit logs in Hyperlight. We should only use tracing that extends log's functionality and adds more features.

Furthermore, some examples would be nice to demonstrate the use of the hyperlight crate as a dependency and show how the logs can be retrieved regardless of which crate (log or tracing) the example uses.</issue_description>

<agent_instructions>Make sure the log crate is not used any more.
Furthermore, ensure the behaviour is similar when the embedder uses either log or tracing.</agent_instructions>

Comments on the Issue (you are @copilot in this section)

• Fixes Use tracing crate instead of log to create logs #1028

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[dblnz]

I am not sure if we want to remove the #[instrument] condition from hyperlight-common. But, considering the hyperlight guests can now use the same tracing crate as the host, I think this would be fine

[dblnz]

I think we can remove parent = Span::current() because it is the default and it is redundant

[Copilot]

Removed parent = Span::current() from all 49 occurrences in flatbuffer_wrappers files and removed the now-unused Span imports. (f4dd6d2)

[jsturtevant]

@copilot look at the suggestions