Support for Interchain accounts filtering policy

[adizere]

We should add an option in the mode.packets or chain section of config.toml that toggles on/off relaying of packets that are related to Interchain accounts.

Update:

This has been implemented by adding support for wildcards in the packet filter config, eg. to only relay on channel-0 and on all ICA channels:

[chains.packet_filter]
policy = 'allow'
list = [
  ['ica*', '*'],
  ['transfer', 'channel-0'],
]

[romac]

This has been implemented by adding support for wildcards in the packet filter config, eg. to only relay on channel-0 and on all ICA channels:

[chains.packet_filter]
policy = 'allow'
list = [
  ['ica*', '*'],
  ['transfer', 'channel-0'],
]