feat: persisted Station ID passed to Zinnia

[bajtos]

Introduce the concept of a Station instance ID that's represented as a public key of an Ed25119 keypair.

Generate the keypair on the first start and store it in a state file. Load the keypair from the state file on subsequent starts.

Introduce an optional env var PASSPHRASE allowing operators to specific a passphrase that will be used to encrypt & decrypt the file storing the keypair.

Implement an upgrade path allowing users to start with an empty PASSPHRASE and later upgrade their deployment with a PASSPHRASE string. Station will load the plaintext keypair and encrypt it using the new PASSPHRASE when it detects this situation.

Forward the Station ID to Zinnia via env vars and include it in the telemetry data written to InfluxDB.

Closes #406

[socket-security]

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Package	New capabilities	Transitives	Size	Publisher
npm/[email protected]	environment Transitive: filesystem, shell	+6	81.2 kB	kentcdodds

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[bajtos]

@juliangruber @PatrickNercessian I addressed the comments, and the pull request is ready for final review and merging.

@juliangruber if we manage to land this PR today, could you please land #414 as well, before publishing a new Station Core release.