Add http/protobuf smoke tests

[pkanal]

Which problem is this PR solving?

Adds smoke tests for the example aspnetcore example app over http/protobuf. These will eventually be used for CI smoke tests to ensure our core functionality works as expected.

• Closes [smoke tests] add smoke-sdk-http bats test #236

Short description of the changes

• Added app-sdk-http service to smoke-tests/docker-compose.yml that starts the example app with the traces endpoint configured to send traces over http to the collector and set the protocol to http/protobuf
• Added some-tests/test_helpers/utilities.bash which is largely the same as the utilities in the Java distro, the only difference is the string we're looking for to indicate that the app is ready.
• Added bats tests in smoke-tests/smoke-sdk-http.bats that test manual instrumentation for traces

How to test

1. Fetch this branch locally and check it out
2. cd smoke && bats ./smoke-sdk-http.bats

You should see two passing tests

Out of scope

• While working on this I realized that HONEYCOMB_API_ENDPOINT does not append v1/traces by default. Is this something we want to add in? Our distro spec doesn't mention anything about it, but our Java distro seems to append the path.
• Do we want to add any metrics or logs tests?

[MikeGoldsmith]

Looks great 👍🏻