Adds a secret checksum annotation to deployment

[DhritiShikhar]

Issue Link -> CFE-366

Changes:

1. Adds a watch for target secret
2. Creates hash of target secret data
3. Adds hash to deployment's annotation Example: externaldns.olm.openshift.io/credentials-secret-hash: 72ddc0c540ab3a290e138726940591debf14c581

[lmzuccarelli]

/lgtm

[openshift-ci[bot]]

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[lmzuccarelli]

/lgtm

[lmzuccarelli]

/approve

[openshift-ci[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: DhritiShikhar, lmzuccarelli, sherine-k

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Needs approval from an approver in each of these files: - ~~[OWNERS](https://github.com/openshift/external-dns-operator/blob/main/OWNERS)~~ [lmzuccarelli] Approvers can indicate their approval by writing `/approve` in a comment Approvers can cancel approval by writing `/approve cancel` in a comment

[alebedev87]

/label tide/merge-method-squash

[alebedev87]

/label docs-approved /label px-approved /label qe-approved