feat: make loadPersistedQuery public

[jaulz]

• Added or updated tests
• Documented user facing changes
• Updated CHANGELOG.md

Changes

This PR will remember persisted queries locally. The idea is related to #2561. Right now, I use the StartOperationOrOperations event to determine whether the query is allowed or not. This works fine but previously defined queries will not work anymore as soon as I release another version. Hence, I would like to check first if the query was persisted before:

$query = rescue(fn () => $graphql->loadPersistedQuery($operationId), null, false);

if ($query) {
  return true;
}

This PR makes loadPersistedQuery public and also remembers persisted queries locally to avoid hitting the cache twice.

Please let me know what you think and I can try to implement tests as well.

Breaking changes

n/a

[spawnia]

Can we just make the method public for now?

[jaulz]

@spawnia sure, fine for me 😊 I anyway hope that there will be something built-in to allow pre-defined queries and mutations in the future 😉

[spawnia]

Thank you @jaulz, released with https://github.com/nuwave/lighthouse/releases/tag/v6.40.0.