fix(client-cloudfront-keyvaluestore): use sigv4a signer by default

[kuhe]

This PR changes the default signer to SignatureV4MultiRegion for @aws-sdk/client-cloudfront-keyvaluestore.

Without this change, to use certain features, users must manually set the signer like so:

const { SignatureV4MultiRegion } = require("@aws-sdk/signature-v4-multi-region");
require("@aws-sdk/signature-v4-crt");

const client = new CloudFrontKeyValueStoreClient({
  region: "us-east-1",
  signerConstructor: SignatureV4MultiRegion,
});

After this change is released:

require("@aws-sdk/signature-v4-crt");

const client = new CloudFrontKeyValueStoreClient({
  region: "us-east-1",
  // default signer is SignatureV4MultiRegion, no need to explicitly set it
});

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