avro

AVRO-2211: SchemaBuilder equivalent or other means of schema creation (#1597)

* AVRO-2211: Support schema creation

* Add license info to new files

* Fix documentation for FixedSchema ctor

* Remove and sort using

* Add missing brackets and replace var with explicit type

* Fix exception type in case of parsing

* Rename field to follow conventions

* AVRO 2211: Inlining temporary variable in linq

* AVRO-2211: Change exception type and add missing documentations

* AVRO-2211: Fix RecordSchema to set the positions of it's fields, instead of verifying it

* AVRO-2211: Fix RecordSchema fields assignment when creation new RecordSchema

* AVRO-2211: Change constructors of schema classes to factory method

* AVRO-2211: Add unit tests for RecordSchema and EnumSchema

* :AVRO-2211: Remove whitespace

* :AVRO-2211: Add symbol names verification for EnumSchema

* AVRO-2211: Fix enum name validation

* AVRO-2211: Throw AvroException consistently

* AVRO-2211: Throw AvroException in RecrodSchema consistently

* AVRO-2211: Remove duplicate factory methods on MapSchema

* AVRO-2211: Remove redundant parameter doc

* AVRO-2211: Add Schema creation tests

* AVRO-2211: Change ValidateSymbol to throw exception

* AVRO-2211: Fix typo

* AVRO-2211: Fix code QL issues

* AVRO-2211: Fix typo

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