Lenient http-spec

[P0lip]

Chore summary The low-level goal is to make http-spec treat malformed input in a more graceful manner. The high-level goal is to improve UX in Studio, in particular when you open an existing spec that's incorrect.

Tasks

• [ ] upgrade to TS 3.7
• [ ] use Optional<DeepPartial<actual shape>> whenever possible
• [ ] drop all calls clobbering typings such as lodash.get and use optional chaining operator
• [ ] add a couple of tests covering edge cases

Additional context Prettier uses outdated typescript/es-tree parser and won't parse optional chaining operator correctly. For the time being, suggest turning off prettier rule in TSLint config until they upgrade it.

[P0lip]

Optional<DeepPartial<actual shape>> might be look tad controversial, therefore if you all think it's an overkill, we can stick with DeepPartial<actual shape>.

[chohmann]

@P0lip is this issue still relevant?

[P0lip]

Yeah, it's still relevant. The situation has improved over the time, but there is still plenty to be done. FWIW, Vincenzo has context on this one, as we used to ~rant~ chat about it in the past.