[feature] filter by community values

[digizeph]

We currently miss the capability to filter by community values.

We currently have four different types of community values, which makes building a filter slightly more complex than it sounds.

bgpkit-parser/src/models/bgp/community.rs

Lines 9 to 14 in 78e9aca

	pub enum MetaCommunity {
	Plain(Community),
	Extended(ExtendedCommunity),
	Ipv6Extended(Ipv6AddrExtCommunity),
	Large(LargeCommunity),
	}

We might need to start from basic Community and LargeCommunity.

Relevant issue: #169