Reworked options to be variadics

[eko]

Actually, interfaces looks like this:

type CacheInterface[T any] interface {
	Get(ctx context.Context, key any) (T, error)
	Set(ctx context.Context, key any, object T, options *store.Options) error
	Delete(ctx context.Context, key any) error
	Invalidate(ctx context.Context, options *store.InvalidateOptions) error
	Clear(ctx context.Context) error
	GetType() string
}

This leads to having to pass nil as the last options argument when we do not want to have any option (which is the case very often).

In this pull request, both Cache and Store interfaces have been updated to the following:

type CacheInterface[T any] interface {
	Get(ctx context.Context, key any) (T, error)
	Set(ctx context.Context, key any, object T, options ...store.Option) error
	Delete(ctx context.Context, key any) error
	Invalidate(ctx context.Context, options ...store.InvalidateOption) error
	Clear(ctx context.Context) error
	GetType() string
}

Using variadics, it allows to have optional arguments so we've moved to the following way to pass options:

err := cacheManager.Set(
    ctx,
    "my-key",
    "my-value",
    store.WithExpiration(10 * time.Second),
    store.WithTags([]string{"my-amazing-tag"}),
)

or, when no option:

err := cacheManager.Set(ctx, "my-key", "my-value")

This pull request have also updated stores interfaces. Hard work but it was really necessary to have a better developer experience for v3 ✌️