chore: prepare release 0.2.0

[github-actions]

This PR was created automatically. Merging it will finalize the changelog for 0.2.0

Breaking Changes

• The SDK has been moved to its own package go.sia.tech/siastorage

Features

• Add a Prometheus metrics endpoint to the admin API.
• Add warmup connections to the client.
• Download geoip database on demand rather than embedding it.

Fixes

• Adjust max fund limit to exclude uploads when account remaining storage is 0
• Don't consider hosts on "bad" QUIC ports usable
• Fixed auth check succeeding for soft deleted accounts.
• Use deltas for stats to reduce contention

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