avro

Support for parsing a list of schemas which may have cross dependencies (#173)

* Added ability to parse a list of schemas, which may have cross dependencies. Added tests

* Fixing the formatting

* A bit more formatting

* Added a comma to please clippy

* Switched an ok_or to an ok_or_else at the behest of clippy

* Following fixes: Fixed some docstrings, a new error for name collisions when using parse_list, guarantees that input order matches output order

* Removed an unused import

* Small formatting fixes

* Added another test involving fullnames

* Added test that ensures when a recursive type is put in, the algorithm does blow the top off the stack but returns an error

* removed unused variable

* Updated readme and one tiny fix