Move all executors to the internal folder package. This PR also comes
with additional breaking changes.
Changes:
- refactor: move all executors to the internal/executor package.
- refactor: update naming patterns for constants, variables, custom
types, etc.
- fix(breaking): renamed the update command to edit.
- fix(breaking): update the flags for the switch command to make it
more generic.
- fix(breaking): renamed the show-account-relationship flag to
show-relationship.
- fix: update the print message from the whoami command.
