add tool subcommand that uses urfave/cli/v3 by burmudar · Pull Request #1205

add tool subcommand that uses urfave/cli/v3 by burmudar · Pull Request #1205 · sourcegraph/src-cli

added 2 commits

- only used when SRC_INTERNAL_CLIFLAGS_V2 is 1
- add 'old' command, which runs the usual src cli commands until all
  commands are migrated

burmudar requested review from a team and removed request for a team