Rework using webapi-parser

[postatum]

Major changes (BREAKING):

• Rewrote to work with webapi-parser (Rework using webapi-parser #205);
• New dependency: webapi-parser;
• Dropped dependencies: datatype-expansion, raml-1-parser;
• All the library API now accepts webapi-parser objects instead of JS Objects/JSON;

Minor changes:

• Updated dependencies' versions;
• Switched to const/let instead of var;

Making a release:

• Release dependencies PRs;
• Bump major version and make a release;

PR depends on:

• Rework using webapi-parser mulesoft-labs/osprey-router#31
• Rework using webapi-parser mulesoft-labs/osprey-resources#23
• Rework using webapi-parser mulesoft-labs/osprey-method-handler#61

Performance:
Performance changes are described (and can be updated) in the osprey-profiling repo.

To test the PR locally with all the reworked Osprey sub-dependencies, use this Makefile.

[postatum]

🥳