tarantool / go-tarantool / 6979609912

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api: write a connection schema getter

Write a helper function to load the actual schema for the user.

Previously we stored actual schema in a private `schemaResolver`
field and `Schema` field was used only to get a current schema.
But now because of the new function, we don't need to store the
`Schema` as a different field. So `Schema` was also removed.

To update the schema, one needs to use `GetSchema` + `SetSchema`
in pair. `SetSchema(Schema)` replacing the `OverrideSchema(*Schema)`.

`Spaces` and `SpacesById` fields of the `Schema` struct store spaces by value.
`Fields` and `FieldsById` fields of the `Space` struct store fields by value.
`Index` and `IndexById` fields of the `Space` struct store indexes by value.
`Fields` field of the `Index` struct store `IndexField` by value.

Closes #7

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