List or execute code lenses for a file

Usage:
  gopls [flags] codelens [codelens-flags] file[:line[:col]] [title]

The codelens command lists or executes code lenses for the specified
file, or line within a file. A code lens is a command associated with
a position in the code.

With an optional title argment, only code lenses matching that
title are considered.

By default, the codelens command lists the available lenses for the
specified file or line within a file, including the title and
title of the command. With the -exec flag, the first matching command
is executed, and its output is printed to stdout.

Example:

	$ gopls codelens a_test.go                    # list code lenses in a file
	$ gopls codelens a_test.go:10                 # list code lenses on line 10
	$ gopls codelens a_test.go gopls.test         # list gopls.test commands
	$ gopls codelens -run a_test.go:10 gopls.test # run a specific test

codelens-flags:
  -d,-diff
    	display diffs instead of edited file content
  -exec
    	execute the first matching code lens
  -l,-list
    	display names of edited files
  -preserve
    	with -write, make copies of original files
  -w,-write
    	write edited content to source files