Schemas

[kuhe]

This is a tracking issue for implementing schema objects and associated features.

Since schemas are an implementation detail that is not relevant to the typical generated-client consumer, I won't go into a long explanation of what they do. They are instruction objects for request serialization and response deserialization.

Going along with this change, two features are planned:

• protocol selection can be done at runtime for clients, enabling different communication formats with services supporting more than one protocol without needing to generate separate clients.
• BigDecimal and BigInteger support for all protocols and formats.

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PRs

PoC branch - #1592

#1593 - schema types
#1594 - migrate serde functions
#1595 - schema runtime classes
#1599 - java codegen
#1603 - BigInt and BigDecimal support in CBOR codec

AWS SDK for JavaScript (downstream consumer)

PoC branch - aws/aws-sdk-js-v3#6986

aws/aws-sdk-js-v3#7110 - protocol runtime classes
aws/aws-sdk-js-v3#7109 - (chore) import core submodules instead of index