Nullability: remove `@ignoreErrors`, `@catchField` and add `@catchByDefault`

[martinbonnin]

See https://github.com/apollographql/specs/pull/50

Bump nullability version to 0.4:

extend schema @link(url: "https://specs.apollo.dev/nullability/v0.4", import: ["@semanticNonNull", "@catch", "@catchByDefault", "CatchTo"])

extend schema @catchByDefault(to: THROW) # or some other default

Allows to set @catchByDefault on operations/fragments:

fragment QueryDetails on Query @catchByDefault(to: RESULT) {
  nonNull 
  nullable 
}

query Fragments @catchByDefault(to: NULL) {
  ...QueryDetails
  nonNull 
  nullable 
}

This unlocks scenarios like:

• extend schema @catchByDefault(to: NULL) to start exploring the directives
• Add @catch to individual fields, get more comfortable with how it works
• When ready to do the big switch, change to extend schema catch(to: THROW) and (at the same time) add query GetFoo @catch(to: NULL) {} on all operations/fragments (this should be a no-op)
• From this moment on, new queries written are catch(to: THROW) by default
• Remove query GetFoo @catch(to: NULL) {} progressively

[netlify[bot]]

✅ Deploy Preview for apollo-android-docs canceled.

Name	Link
🔨 Latest commit	b83408dcbaeb8b0127fe42319cd7b4e6f1dd97e0
🔍 Latest deploy log	https://app.netlify.com/sites/apollo-android-docs/deploys/667c939ff1cc140007bd8ff1