chore: sync models and endpoints

[aajtodd]

Issue #

N/A

Description of changes

• Sync AWS models and endpoints.json

New services:

 create mode 100644 codegen/sdk/aws-models/chimesdkidentity.2021-04-20.json
 create mode 100644 codegen/sdk/aws-models/chimesdkmessaging.2021-05-15.json
 create mode 100644 codegen/sdk/aws-models/memorydb.2021-01-01.json
 create mode 100644 codegen/sdk/aws-models/opensearch.2021-01-01.json
 create mode 100644 codegen/sdk/aws-models/proton.2020-07-20.json
 create mode 100644 codegen/sdk/aws-models/route53recoverycluster.2019-12-02.json
 create mode 100644 codegen/sdk/aws-models/route53recoverycontrolconfig.2020-11-02.json
 create mode 100644 codegen/sdk/aws-models/route53recoveryreadiness.2019-12-02.json
 create mode 100644 codegen/sdk/aws-models/snowdevicemanagement.2021-08-04.json

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