[issue31392] add / clean up formatting of doc comments in avro format
[issue31392] bump avro from 1.7.6 -> 1.7.7
[issue31391, issue31392] switch CoderResult from ResultG[FailedPath, A] to ResultG[CoderFailure, A] with CoderFailure carrying the FailedPath along with source location information, e.g. line and column number from input
[issue31391] fix unit test for string format to use common ScalaEnum fixture rather than copy pasta one
[no issue] whitespace tweak
[issue31392] test various combinations of @default and default expressions
[issue31393] first commit of Jackson format with scalars working. left to do: containers and derived.