[FEATURE] Make fileset python client pluggable

[yuqi1129]

Describe the feature

As Gravitino has support fileset that can be easily pluggable, for example, users or developers can custom fileset type and access this fileset through GVFS Java client without changing Gravitino code. However, the Python client needs to be changed to access this fileset.

We need to make the Python client capable of accessing custom fileset without modifying the code and introduce a mechanism similar to HCFS.

Motivation

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Describe the solution

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Additional context

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