feat(tap): Adding support for schema

[rvantunes]

Context

We need to read JSONL files with complex structs, including many data types like array, object, datetime, string, etc...
The current implementation offers jsonl_type_coercion_strategy to decide how the tap is going to infer the schema. The problem is that none of the coercion strategies works for our use case. Besides that, the jsonl_sampling_strategy only supports first which does not work for our use case.

This PR implements a possible solution, by adding a new parameter named schema. This parameter would be parsed by Meltano SDK, see here.

If the user decides to specify a fixed schema, the tap does not need to create the schema dynamically, ignoring the coercion strategy.

Changes

• Adding a new parameter to specify schema
• Updating documentation
• Fixing typos
• Adding IDE files in .gitignore

[leonardoeloy]

@visch this approach seemed to be the best solution when we have full control of the schema