Support Multiple Export Formats for lino pull Command

[youen]

Currently, the lino pull command supports exporting data in JSONL format. While JSONL is a flexible and widely-used format, it may not always be suitable for all use cases. To address the needs of a broader range of users and applications, we propose enhancing the lino pull command to support multiple export formats.

New Formats to Support:

1. SQL: Generate SQL scripts that can be executed or saved as files to initialize a test database. This is particularly useful for testing applications that do not support JSONL, such as Spring Boot applications.
2. Avro/Parquet: Optimize CPU consumption and file compression by using binary serialization formats like Avro or Parquet.

Proposed Changes:

• Add a --format flag to the lino pull command, allowing users to specify the export format.
• Implement export options for SQL and Avro/Parquet formats.
• Ensure compatibility with existing flags and options in the lino pull command.
• Update the documentation to reflect the new export formats and usage examples.

Impact:

• Users will have more flexibility in choosing the format that best suits their application's needs.
• Improve performance and storage efficiency for users who require compressed binary formats.

Acceptance Criteria:

• The lino pull command successfully exports data in the specified format (SQL, Avro, Parquet).
• Documentation and usage examples are updated.
• Comprehensive tests are added for each export format.

[youen]

ping @adrienaury