NH-85973 instrument function handler dependencies

[cheempz]

Description

From Jira discussion it seems possible to try loading the original handler file (causing all function dependencies to also be loaded), then load solarwinds_apm which will bootstrap instrumentations based on loaded libraries.

This is a POC for how we might use the existing OTel Lambda Handler instrumentation's resolve_original_handler on initialization to achieve the loading.

Test (if applicable)

Quick test with this change and a function that requires the aws-sdk-lambda gem has this in CW log:
I, [2024-07-24T23:09:51.172528 #15] INFO -- : Instrumentation: OpenTelemetry::Instrumentation::AwsSdk was successfully installed with the following options {:inject_messaging_context=>false, :suppress_internal_instrumentation=>false}

Unfortunately I'm still not getting the AWS SDK span, maybe due to span context issue that would be fixed by open-telemetry/opentelemetry-ruby-contrib#1073

[cheempz]

Will be in new PR off of https://github.com/solarwinds/apm-ruby/tree/NH-85973