Expose Rust driver's metadata in JS driver's API

[wprzytula]

Currently, JS driver fetches and holds its own metadata. Not to overhead (including make memory usage) for metadata twice as big, let's instead expose Rust driver's metadata.

[wprzytula]

@adespawn Does our driver currently fetch and hold its own metadata?

[adespawn]

The JS or Rust part of the driver?

[wprzytula]

The JS part. This is what I stated here:

Currently, JS driver fetches and holds its own metadata.

I suspect it's not accurate.

[adespawn]

I suspect it's not accurate.

It's not

[adespawn]

Rust driver's metadata

is this a ClusterState or also something else?

[wprzytula]

Rust driver's metadata

is this a ClusterState or also something else?

Yep. It holds topology (known_peers), schema (keyspaces), and replication info (locator).