[Subtask] Design Metric View support in Gravitino

[mchades]

Describe the subtask

Define how Gravitino should manage Metric Views as governed and versioned semantic metadata.

Parent issue

#12209

[mchades]

Here is the initial design of the Metric View. Comments and discussions are welcome.
https://docs.google.com/document/d/1C8oS-fiBDM_yBdbr9ifYSeDKI_BKyBAvDXpOZYonLFo/edit?usp=sharing