feat(credential-provider-web-identity): support web federated identity

[AllanZhengYP]

Description

Add a new credential provider that wraps the sts:AssumeRoleWithWebIdentity API. This credential provider will be equivalent to the AWS.WebIdentityProvider in v2 SDK(getting started guide).

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• CodeBuild project: sdk-staging-test
• Commit ID: 83d9337
• Result: SUCCEEDED
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