Add support for Filestore Zonal/Regional instances with 1-10Tb volume into Filestore CSI driver

[SerhiiRohoza]

Hello,

Accordingly to the official documentation:

Requirements

• To use the Filestore CSI driver, your clusters must use the proper GKE version number applicable to your service tier:
  • Basic HDD with GKE version 1.21 or later
  • Basic SSD with GKE version 1.21 or later
  • Zonal (10 TiB to 100 TiB) with GKE version 1.27 or later
  • Enterprise with GKE version 1.25 or later
• To use the Filestore multishares capability, your clusters must use GKE version 1.25 or later.
• The Filestore CSI driver is supported for clusters using Linux only; Windows Server nodes are not supported.
• The minimum instance size for Filestore is at least 1 TiB. The minimum instance size depends on the Filestore service tier you - selected. To learn more, see Service tiers.

Meanwhile, 10Tb volume is too expensive and overkill for many use cases.

It'll be useful to have even basic/limited support of Filestore Zonal/Regional instances with 1-10Tb volume size in Filestore CSI driver with a clear information in the documentation.