Cache IMDS metadata token till it expires

[trivikr]

Is your feature request related to a problem? Please describe.

From How Instance Metadata Service Version 2 works

IMDSv2 uses session-oriented requests. With session-oriented requests, you create a session token that defines the session duration, which can be a minimum of one second and a maximum of six hours. During the specified duration, you can use the same session token for subsequent requests. After the specified duration expires, you must create a new session token to use for future requests.

In fromInstanceMetadata, the token is fetched in every call.

aws-sdk-js-v3/packages/credential-provider-imds/src/fromInstanceMetadata.ts

Lines 58 to 61 in 4f02b78

	let token: string;
	try {
	token = (await getMetadataToken({ ...endpoint, timeout })).toString();
	} catch (error) {

Describe the solution you'd like

Cache IMDS metadata token till it expires, thus reducing the number of calls to metadata service.

Describe alternatives you've considered

Request customers to write custom implementation of fromInstanceMetadata which caches token.

Additional context

The feature request came up while debugging retry strategy options for RemoteProviderConfig requested in #2706

[github-actions]

Greetings! We’re closing this issue because it has been open a long time and hasn’t been updated in a while and may not be getting the attention it deserves. We encourage you to check if this is still an issue in the latest release and if you find that this is still a problem, please feel free to comment or open a new issue.

[github-actions]

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