CI: add linters & code formatters

[spicyfalafel]

• snapshot tests structure:
  └── aidbox_sdk
  ├── snapshots
  │   └── typescript
  | | └── hl7-fhir-r4-core
  | | | └── Account.ts
  | | | └── ActivityDefinition.ts
  | | └── hl7-fhir-r5-core
  │   └── python
• typescript linter
• python linter
• c# linter
• java linter
• pre-commit hooks?
• code formatters?