feat(transport/all): Add ability to specify []otelhttp.Opts for transport when create new HTTP client

[surik]

See https://github.com/googleapis/google-api-go-client/issues/3138

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[quartzmo]

@surik Can you please open a feature request issue in this repo explaining your need for otelhttp.Option in the HTTP Client? Thank you.

[surik]

Hi @quartzmo, I've opened a request https://github.com/googleapis/google-api-go-client/issues/3138

[quartzmo]

Kokoro CI failed with staticcheck:

internal/settings.go:193:64: type assertion to the same type: o already has type otelgrpc.Option (S1040)

[codyoss]

We are going to hold off on this PR for now as our team is investigating some cross language support for open telemetry yet this year. For the sake of consistency I don't want to add new options yet. We will make sure to bring up this user journey as we thoughtfully design this integration.