Use Typescript strict mode

[PowerKiKi]

• ApolloBase.client throws an error if no client has been created beforehand. The behavior now matches the typing that always declared a client existed. In most cases, you should pass either apolloOptions or apolloNamedOptions to Apollo.constructor to create the client immediately upon construction.
• ApolloBase.query(), ApolloBase.mutate() and ApolloBase.subscribe() all have a new constraint on V. If you inherit from this class, you might need to adjust your typing.
• Classes that inherit Query, Mutation and Subscription must declare the document member. This requirement always existed at runtime but was not enforced at compile time until now. If you generated code, you have nothing to do.
• QueryRef.getLastResult() and QueryRef.getLastError() might return undefined. This was always the case, but was typed incorrectly until now.
• pickFlag() was dropped without any replacement.
• createPersistedQueryLink() requires options. This was always the case but was typed incorrectly until now.

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🦋 Changeset detected

Latest commit: 2ac7e0916aebfb0b43865757abe0c3aad195814e

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

| Name | Type | | -------------- | ----- | | apollo-angular | Major |

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### 💻 Website Preview The latest changes are available as preview in: [https://d5b9925c.apollo-angular.pages.dev](https://d5b9925c.apollo-angular.pages.dev)

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🚀 Snapshot Release (alpha)

The latest changes of this PR are available as alpha on npm (based on the declared changesets):	Package	Version	Info
apollo-angular	7.0.0-alpha-20240405052043-2ac7e0916aebfb0b43865757abe0c3aad195814e	npm ↗︎ unpkg ↗︎