expose ephemeralMessageId on Message / CallbackQueryContext (Bot API 10.2)

[adriangalilea]

Bot API 10.2 ephemeral messages carry ephemeral_message_id instead of an ordinary message_id, and it's the only handle for editEphemeralMessageText. @gramio/types 10.2.0 already types the field on TelegramMessage, but contexts (0.9.0) has no getter, so a callback handler that wants to edit the tapped ephemeral view in place has to read the raw payload.

We're shimming it locally in the meantime. Suggested shape, mirroring threadId / db7bf0f:

src/structures/message.ts:

/** For ephemeral messages, identifier of the ephemeral message inside this chat (Bot API 10.2). */
@Inspect({ nullable: false })
get ephemeralMessageId() {
	return this.payload.ephemeral_message_id;
}

src/contexts/callback-query.ts, next to threadId:

/** Identifier of the originating ephemeral message, or undefined for an ordinary one. The only
 *  handle for editing the tapped ephemeral view in place (editEphemeralMessageText). */
get ephemeralMessageId() {
	return this.message?.ephemeralMessageId;
}

Needs the @gramio/types dep at ^10.2.0 for the field's typing.