[email protected] (#841)

BREAKING

• Move NodeLocation and FileId from apollo_compiler::validation to the crate root - SimonSapin, pull/838

Maintenance

• Remove Salsa database for 1.2× ~ 2× validation speed - SimonSapin, pull/838
  We were not taking advantage of caching it provides.
  Additionally, validation uses Schema and ExecutableDocument directly
  rather than converting them to AST.

  $ cargo bench --bench multi-source
  supergraph parse_and_validate
                        time:   [398.09 µs 399.32 µs 400.82 µs]
                        change: [-19.966% -19.418% -18.864%] (p = 0.00 < 0.05)
                        Performance has improved.
  simple_query parse_and_validate
                        time:   [12.097 µs 12.104 µs 12.113 µs]
                        change: [-52.467% -52.282% -52.109%] (p = 0.00 < 0.05)
                        Performance has improved.