Add error codes in service create

[edaena]

closes microsoft/bedrock#1339

[dennisseah]

@edaena. I have amended your PR for 3 things.

1. do not terminate the execute function in the middle of it. We throw error let the final catch block for the error chain
2. Error messages need to have a statement in past tense on what had happen; followed by a statement in present tense to explain what the user can do to resolve it.
3. remove unused constants in constants.ts

thanks