[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. https://github.com/bgpkit/bgpkit-parser/blob/78e9acad7e42993942cf618778e7b9446342a6dc/src/models/bgp/community.rs#L9-L14

We might need to start from basic Community and LargeCommunity.

Relevant issue: #169