Add new Gatekeeper operator API options

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These options should use the same defaults provided by Gatekeeper (see its Helm chart), which is typically the safe value of false, or null, etc. These encompass all the Gatekeeper Helm Chart options provided in v3.5.1. We should consider whether to add all of them or on an as-needed basis.

GatekeeperSpec:

• validatingWebhookTimeoutSeconds
• enableDeleteOperations
• PodLabels

ImageConfig:

• pullSecrets

Gatekeeper Controller Manager (WebhookConfig):

• --log-denies
• --disable-opa-builtin (e.g. http.send) (Update Operator to support Gatekeeper v3.5.1 #181)
• hostNetwork
• priorityClassName
• PodDisruptionBudget (see below)

Gatekeeper Audit (AuditConfig):

• --audit-match-kind-only
• hostNetwork
• priorityClassName

PodDisruptionBudget (consider adding this object to the Gatekeeper Controller config WebhookConfig):

• minAvailable

ResourceQuota (consider embedding this object into each controller config e.g. WebhookConfig):

• podCountLimit

• SecretAnnotations

Service:

• type
• loadBalancerIP