feat: add "onError" hook to generated clients

[joshmossas]

No description provided.

[joshmossas]

Closes #96

[nx-cloud]

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✅ Successfully ran 11 targets

• nx build-server test-server-go
• nx build-server test-server-ts
• nx affected -t test
• nx run-many -t compile
• nx affected -t integration-test --parallel=false
• nx affected -t integration-test --exclude test-client-kotlin,test-client-swift
• nx affected -t typecheck
• nx run-many -t build --exclude=ts-playground,go-playground
• nx affected -t pub -- get
• nx run-many -t pub -- get
• nx affected -t lint

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