[EuiDataGrid] Add className to EuiDataGridSchemaDetector

[snide]

We should add a required className to EuiDataGridSchemaDetector so that classes can be more distinct.

#2449 (comment)

[anishagg17]

@snide should i add className only to EuiDataGridSchemaDetector interface

or

add it in interface and also add it as a prop to every component that uses this ?

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