[minio-manager](minor/refactoring) Minio bucket policy action blocks

[alpozcan]

Which Chart?
minio-manager

Chart version
0.3.0

Describe the bug
Not a bug, see below.

To Reproduce
N/A

Expected behaviour
N/A

Proposed Solution (if any)

If we name the policies like so instead:

List, Get: policy-...-read
the above plus Put : policy-...-write
the above plus Delete: policy-...-fullwrite (or fullaccess)

and the chart would have these 'roles' statically defined, and with an if condition matching on the suffix as above, we can assign the correct policy actions into them. If the policies we want, although custom, can be 'preset', we can use policy building blocks for the actions and make the values file leaner and leave less room for error.

Additional context
N/A