[FE] Build changelog for AsyncAPI specifications #513
Description
Implement build type changelog in api-processor for AsyncAPI specifications.
The approach is the same as for REST and GraphQL- process whole specification(s) using api-diff, collect data for specific APIHUB operations from merged tree.
Diffs for corresponding message should be collected for sure. Need to define which other parts of the specification should contribute to the single APIHUB operation diffs (channel, (asyncapi) operation, some other parts of the specification related to the APIHUB operation?)