`{extensions}`: Improve `Extension` interface methods naming.

[chris-ramon]

Actual

Currently the extensions component defined in:

graphql/extensions.go

Lines 32 to 33 in 58689e0

	// Extension is an interface for extensions in graphql
	type Extension interface {

Contains methods that are named in a way that could be clearer, for example:

graphql/extensions.go

Lines 40 to 41 in 58689e0

	// ParseDidStart is being called before starting the parse
	ParseDidStart(context.Context) (context.Context, ParseFinishFunc)

^ It is not clear if the hook executes before or after the Parse process started.

Expected

We want to update the Extensions interface methods to a clearer naming using precise prefix, eg:

ParseDidStart -> BeforeParseHook

Using the same re-naming strategy: Before/After<Component Name>Hook we want to update the other methods.

For backwards compatibility let's keep the existing methods as a fallback.

Notes

• This naming improvement was found while working in a University Thesis via the following PR: Add Extensions component implementation description chris-ramon/thesis-graphql-go#66

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