test(test): Adding fuzzer for ContainerPolicy

[prady0t]

Purpose of PR?:

This is a fuzzer for ContainerPolicy

KubeArmor/KubeArmor/policy/policy.go

Line 24 in a5f584c

func (p *PolicyServer) ContainerPolicy(c context.Context, data *pb.Policy) (*pb.Response, error) {

For seed corpus I referred to this policy and removed Metadata.Name from it.
With this we are testing if invalid policy results in PolicyStatus_Invalid or not.
To run the fuzz test,

cd KubeArmor/policy
go test -fuzz=Fuzz

Addresses #1367

Does this PR introduce a breaking change?
NO

[prady0t]

Already found an issue with this. I ran the fuzzer for a while and It failed for this input :

{
    "0000": "00000000000000",
    "oBjeCt": {
        "metAdAtA": {
            "nAme": "0"
        }
    }
}

Which is totally understandable. To fix this we can also have a condition in fuzzer to check for status as Applied if we have policyEvent.Object.Metadata.Name != "" . Here's the log :

--- FAIL: FuzzContainerPolicy (0.00s)
    --- FAIL: FuzzContainerPolicy/69798181ccc6962d (0.00s)
        ContainerPoilcy_fuzz_test.go:58: Unexpected status: Applied, [123 32 32 32 32 34 48 48 48 48 34 58 32 34 48 48 48 48 48 48 48 48 48 48 48 48 48 48 34 44 32 32 32 32 34 111 66 106 101 67 116 34 58 32 123 32 32 32 32 32 34 109 101 116 65 100 65 116 65 34 58 32 123 32 32 32 32 32 32 34 110 65 109 101 34 58 32 34 48 34 125 125 125]
FAIL
exit status 1
FAIL    github.com/kubearmor/KubeArmor/KubeArmor/policy 0.011s

Marking this as a draft for now.