[CLI] Remove some macros
Refactor the implementations for the following CLI methods in order to
avoid using macros:
- init_bridge
- relay_headers
- relay_parachains
Signed-off-by: 
Serban Iorga <[email protected]>
Refactor the implementations for the following CLI methods in order to
avoid using macros:
- init_bridge
- relay_headers
- relay_parachains
Signed-off-by: Serban Iorga <[email protected]>