Accept Metadata type argument on KVNamespace

[tavoyne]

Currently, the shape of the metadata object can only be provided when calling the env.*.getWithMetadata<Metadata>() method, through the first (and only) type argument.

Multiple call of this method => Metadata has to be passed multiple times => not DRY.

Most of the time, we know the shape of this object right where we define the KVNamespace type. I propose that we are able to pass Metadata to KVNamespace as a the second type argument (after K), e.g.:

interface Env {
  SESSIONS: KVNamespace<string, { emailAddress: string }>;
  USERS: KVNamespace;
}

// We can still do that:
env.SESSIONS.getWithMetadata<Metadata>(sessionId);

This (micro) change is backward-compatible.

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