Move signature package to eks-anywhere

[panktishah26]

Description of changes:
We created Signature package to sign the bundle using KMS key as a part of PR #9150. Moving the signature package under eks-anywhere repo to use it for both signing and verification purpose.

Testing (if applicable):
Ran below command to verify the bundle is getting signed
CGO_ENABLED=0 make -C release dev-release

apiVersion: anywhere.eks.amazonaws.com/v1alpha1
kind: Bundles
metadata:
  annotations:
    anywhere.eks.amazonaws.com/excludes: 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
    anywhere.eks.amazonaws.com/signature: MEYCIQDHWr4pRxlAGiRLDkDgBPYbhLTjY9IRN7yRvkXZgyq+eQIhAKPmnk+4wHef1X2XFrVvQsk/+69a+LjgT1d+vEGxz8hW
  creationTimestamp: "2025-01-24T23:50:00Z"
  name: bundles-0
spec:
  cliMaxVersion: v0.0.0
  cliMinVersion: v0.0.0
  number: 0
  versionsBundles:

Documentation added/planned (if applicable):

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[eks-distro-bot]

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[panktishah26]

/test eks-anywhere-e2e-presubmit

[panktishah26]

/test eks-anywhere-generate-files-presubmit

[eks-distro-bot]

@panktishah26: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
eks-anywhere-e2e-presubmit	57c672a	link	true	/test eks-anywhere-e2e-presubmit
eks-anywhere-generate-files-presubmit	57c672a	link	true	/test eks-anywhere-generate-files-presubmit

Full PR test history. Your PR dashboard.

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