Conversation Repository#search_files_by_{content,name}

See https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/16622/diffs where we are moving these methods.

They are used by the project search bar.

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Stages:

• RPC Design: gitaly-proto!188 (merged)

• ~"Client Implementation": #1182 (closed) gitlab-org/gitlab-ce!18750

• Server Implementation: #1150 (closed) !677 (merged)

• ~"Acceptance Testing": #1201 (closed) #1202 (closed)

RPC Endpoints:

• Endpoint::Name

Known Client Routes:

• Known client endpoints

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