Implement alias command with local and API-connected modes#532

InTheCloudDan wants to merge 3 commits into

launchdarkly:mainlaunchdarkly/ld-find-code-refs:mainfrom

InTheCloudDan:dob/aliasGenerationInTheCloudDan/ld-find-code-refs:dob/aliasGenerationCopy head branch name to clipboard