Simplify tracing context parsing

[sferik]

Simplified the parsing of trace and span IDs in try_parse_tracecontext using and_then chains, eliminating unnecessary unwraps.

[propel-code-bot]

This PR refactors the try_parse_tracecontext function to use method chaining with and_then, removing multiple levels of nested match statements and eliminating unnecessary unwraps. The update also changes the usage of traceid and spanid in wrap_span_with_parent_context to pattern match directly, resulting in cleaner and safer handling of Option values.

This summary was automatically generated by @propel-code-bot

[github-actions]

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• Can you think of any use case in which the code does not behave as intended? Have they been tested?
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• If appropriate, are there adequate property based tests?
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