[FEATURE]: add fast_rate and fallback LAG options

[clinta]

Describe the solution you'd like
Lag interface should support setting the options for fast_rate and fallback

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[p3rdu]

Also the System MAC attribute, which is mandatory for EVPN MH 802.3ad PortChannels, is missing from sonic_lag_interfaces
module.

However it is present at mclag module: https://docs.ansible.com/ansible/latest/collections/dellemc/enterprise_sonic/sonic_mclag_module.html#parameter-config/system_mac