Improve `@aliases` support

[seriyps]

• Make sure avro:is_same_type takes them into account
• Make sure avro:is_compatible takes them into account

With this change the is_compatible/2 will be able to say that the schema

{
    "type": "record",
    "name": "EventMeta",
    "fields": [
        {"name": "to_stay", "type": "string"},
        {"name": "new_name", "type": "string", "aliases": ["to_rename"]}
    ]
}

is backwards compatible with

{
    "type": "record",
    "name": "EventMeta",
    "fields": [
        {"name": "to_stay", "type": "string"},
        {"name": "to_rename", "type": "string"}
    ]
}