daemon command to display the file and line/column of the place where a symbol is defined

Feature

I'd like to see a dmypy command (e.g. dmypy find fully.qualified.name or dmypy find /path/to/file:line:column:end_line:end_column) that then displays the /path/to/file:line:column of the original definition of a symbol.

Pitch

This is primarily motivated by enabling deeper editor integrations to allow jumping to a definition in the same file or another file. The output would simply look like

dmypy find builtins.int
/path/to/site-packages/mypy/typeshed/stdlib/builtins.pyi:254:0:362:57
dmypy find builtins.int --json
{"file": "/path/to/site-packages/mypy/typeshed/stdlib/builtins.pyi", "line": 254, "column": 0, "end_line": 362, "end_column": 57}

and the editor would parse the output to allow jumping to the definition.

Start at the dmypy command entry point and trace how symbol definitions and source positions are available through the daemon. Check the existing command and response conventions before deciding how the plain-text and --json forms should be represented; done means both example lookup forms return the original definition range for a symbol.