Add ephemeral parameters to sendLivePhoto

[iamwavecut]

Summary

• add optional ReceiverUserID and CallbackQueryID fields to SendLivePhotoConfig
• serialize them as receiver_user_id and callback_query_id
• cover sendLivePhoto in the Bot API 10.2 ephemeral-send contract test

Verification

• go test -run TestBotAPI102EphemeralSendParams -count=1 -v .
• go test -race -shuffle=on -count=1 -timeout=10m ./...
• go vet ./...
• go test -tags api_parity -run ^TestAPIParity -v .
• git diff --check