Remove shell commands to TelecomShellCommands

Remove shell commands from the commands.Telecom binary and into
TelecomServiceImpl.

For backwards compatibility, still allow Telecom to process the
commands by retrofitting in TelecomShellCommand.

Bug: 327310548
Test: atest CtsTelecomTestCases CtsTelecomCujTestCases
Change-Id: I44fe946046504b804204e1935b02a3047328bf4e
2 files changed