SyncAll feature

[manedurphy]

What this PR does / why we need it:
Adds the .spec.secretObjects[*].syncAll field to the SecretProviderClass definition. With that field set to true, all secrets read from the mount will be synced to K8s secrets for the named SecretObject. With this feature, the user no longer needs to list each secret that they want to sync individually... syncAll will sync everything listed in `.spec.parameters to K8s. Example in the proposal is here.

Which issue(s) this PR fixes (optional, using fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when the PR gets merged):
Addresses #529

Special notes for your reviewer:
I am happy to receive any and all feedback, as well as make any changes necessary

[k8s-ci-robot]

Hi @manedurphy. Thanks for your PR.

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: manedurphy
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[manedurphy]

@tam7t @aramase i am looking forward to both of your reviews :D

[k8s-ci-robot]

@manedurphy: PR needs rebase.

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[tam7t]

Now that 1.0 is out this will need a rebase.

• Also suggest adding the test case to the e2e provider instead of vault
• Add a page to docs/book/src/topics/ describing the feature with examples of basic/tls/opaque SPCs.

[manedurphy]

New PR raise here: #820