Beta APIs for FileSystem and SMB APIGroups

[ddebroy]

What type of PR is this?

Uncomment only one /kind <> line, hit enter to put that in a new line, and remove leading whitespaces from that line:

/kind api-change

/kind bug
/kind cleanup
/kind design
/kind documentation
/kind failing-test
/kind feature
/kind flake

What this PR does / why we need it:
Introduces v1beta1 version of FileSystem and SMB API groups

Which issue(s) this PR fixes:
Fixes #

Special notes for your reviewer:
The v1alpha1 APIs are copied over under the v1beta1 version. There is no difference in the APIs between alpha1 and beta1.

Does this PR introduce a user-facing change?:

Introduces v1beta1 version of FileSystem and SMB API groups

[ddebroy]

FS tests passing with v1beta1:

PS C:\Users\docker\go\github.com\kubernetes-csi\csi-proxy> go test -v .\integrationtests\filesystem_test.go
=== RUN   TestFilesystemAPIGroup
=== RUN   TestFilesystemAPIGroup/PathExists_positive
=== RUN   TestFilesystemAPIGroup/IsMount
--- PASS: TestFilesystemAPIGroup (0.04s)
    --- PASS: TestFilesystemAPIGroup/PathExists_positive (0.04s)
    --- PASS: TestFilesystemAPIGroup/IsMount (0.00s)
PASS
ok      command-line-arguments  0.462s

[jingxu97]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ddebroy, jingxu97

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