Support SQL default expressions in Python datasource schema

Add support for the `>` block syntax in the connection parser,
enabling multiline values like KAFKA_SSL_CA_PEM with PEM certificates.

- Switch connection parser from for-each to index-based while loop
- Use read_directive_block() for KAFKA_SSL_CA_PEM > blocks
- Update generator to emit block syntax for multiline values
- Add tests for multiline parsing and generation

Closes #10

Amp-Thread-ID: https://ampcode.com/threads/T-019d1a2d-e5a7-77fb-b97e-e855f84a34a4
Co-authored-by: Amp <amp@ampcode.com>

Amp-Thread-ID: https://ampcode.com/threads/T-019d1a2d-e5a7-77fb-b97e-e855f84a34a4
Co-authored-by: Amp <amp@ampcode.com>

…irectives

Support multiline directives in connection file parser

Instead of delegating 'tinybird init' to the tinybird CLI (which only
creates config/CI files), the SDK now handles it directly and scaffolds
Python template files (datasources.py, pipes.py, client.py).

- Add 'init' to SDK-owned commands in CLI dispatcher
- Support --folder to customize where templates are created
- Support --force, --skip-login, --dev-mode flags
- Bump version to 0.1.5

Amp-Thread-ID: https://ampcode.com/threads/T-019d1a2d-e5a7-77fb-b97e-e855f84a34a4
Co-authored-by: Amp <amp@ampcode.com>

- Run tinybird CLI init for the full interactive flow (dev mode,
  CI/CD templates, skills install, login)
- Then create a single tinybird_resources.py template with datasources,
  endpoints, and client all in one file
- Update tinybird.config.json include list with the resources file
- Update workflow test to mock the CLI delegation

Amp-Thread-ID: https://ampcode.com/threads/T-019d1a2d-e5a7-77fb-b97e-e855f84a34a4
Co-authored-by: Amp <amp@ampcode.com>

- Split tinybird_resources.py (definitions only) from client.py (Tinybird client)
- Generate main.py with dotenv loading, ingest, and query examples
- Import paths computed dynamically from --folder argument
- Existing files are not overwritten unless --force is used

Amp-Thread-ID: https://ampcode.com/threads/T-019d1a2d-e5a7-77fb-b97e-e855f84a34a4
Co-authored-by: Amp <amp@ampcode.com>

Amp-Thread-ID: https://ampcode.com/threads/T-019d1a2d-e5a7-77fb-b97e-e855f84a34a4
Co-authored-by: Amp <amp@ampcode.com>

When the user doesn't pass --folder but types a folder name in the
tinybird CLI interactive prompt, read the include path from the
generated tinybird.config.json to place SDK files in the right folder.

Amp-Thread-ID: https://ampcode.com/threads/T-019d1a2d-e5a7-77fb-b97e-e855f84a34a4
Co-authored-by: Amp <amp@ampcode.com>

Wire up SDK-owned init command with --folder support