avro

[AVRO-3448][rust] Rust name/namespace spec adherence work (#1602)

* resolved schema struct

* matrix testing started

* [AVRO-3448] encode, decode, parsing in allignment with name/namespace spec

* [AVRO-3448] clippy

* Update lang/rust/avro/src/util.rs

Co-authored-by: Martin Grigorov <martin-g@users.noreply.github.com>

* Update lang/rust/avro/src/schema.rs

Co-authored-by: Martin Grigorov <martin-g@users.noreply.github.com>

* [AVRO-3448] encode with Result return

* [AVRO-3448] clean up types and tests

* AVRO-3448: Fix a typo in an error variant

Signed-off-by: Martin Tzvetanov Grigorov <mgrigorov@apache.org>

Co-authored-by: Martin Grigorov <martin-g@users.noreply.github.com>
Co-authored-by: Martin Tzvetanov Grigorov <mgrigorov@apache.org>