[Bug]: Parent-Child span inheritance has not been set properly for asynchronous function calls

[NipunaMadhushan]

Description

When we use observability tracing for services which uses asynchronous function calls, the Parent-Child span inheritance has not been set properly. We can see two different traces for http request call and for asynchronous function call.

Steps to Reproduce

Use the ballerina observability example in here.

Affected Version(s)

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OS, DB, other environment details and versions

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Related area

-> Observability

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