Use Account ID from C

[waahm7]

Issue #, if available:
#303
Description of changes:

• Reverts feat: Add support for accountId field on Credentials & CredentialsProvider #304 and uses Account ID from C.
• Sub-module update: Fix segfaults -- CRC64NVME on machines with disabled AVX and uri parsing corner case.
• Sub-module update: Fix one byte buffer overflow
• Sub-module update: Bump AWS_EVENT_STREAM_MAX_MESSAGE_SIZE to 256MB

Update the following providers to provide account_id if present.

1. EnvironmentCredentialsProvider: Checks AWS_ACCOUNT_ID env variable.
2. SSOCredentialsProvider: Account id is parsed from the sso_account_id config parameter which was also required for the request.
3. STS: Account_id is parsed from the Arn in the response.
4. STSWebIdentity: Account_id is parsed from the Arn in the response.
5. ProcessCredentialsProvider: Account_id is parsed from AccountId field in the response if present.
6. ECSProvider: Account_id is parsed from AccountId field in the response if present.
7. ProfileProvider: Parses aws_account_id in the config file.

See: awslabs/aws-c-auth#262

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