Refactor go module name to match repo

[tieujason330]

github.com/alluxio/k8s-operator to github.com/Alluxio/k8s-operator for consistency with actual repo name.

running into errors when trying to use as dep

go get github.com/Alluxio/[email protected]                                                                                                                                                                           
go: github.com/Alluxio/[email protected]: parsing go.mod:
	module declares its path as: github.com/alluxio/k8s-operator
	        but was required as: github.com/Alluxio/k8s-operator

[tieujason330]

is anyone using v1.0.1 as a go dependency? bc this would cause a minor conflict if they try to upgrade in the future

[ssz1997]

is anyone using v1.0.1 as a go dependency? bc this would cause a minor conflict if they try to upgrade in the future

No need to worry about it.