Implement cron-updating tables (daily weather, spotify, etc)

[cnbrenci]

// FIXME: unfirebase, remove this before merging PR
//
// See issue about implementing the library manifest system here:
// #56472
//
// Current tables are live updated, the data is NOT copied into
// the student project, instead a new type of f*rebase node is created
// like /v3/channels/NZfs8i-ivpdJe_CXtPfHtOCssNIRTY1oKd5uXfSiuyI/current_tables/Daily Weather
// as opposed to a normal table that would be like
// /v3/channels/NZfs8i-ivpdJe_CXtPfHtOCssNIRTY1oKd5uXfSiuyI/storage/tables/Daily Weather
//
// Current tables can be found in https://console.firebase.google.com/project/cdo-v3-shared/database/cdo-v3-shared/data/~2Fv3~2Fchannels~2Fshared~2Fmetadata~2Fmanifest~2Ftables
// where the table has current: true set in the manifest object
// DatablockStorage.addCurrentTableToProject = function (
// tableName,
// onSuccess,
// onError
// ) {
// _fetch('add_shared_table', 'POST', {
// table_name: tableName,
// }).then(onSuccess, onError);
// };
//
// Makes a project-local copy of one of the tables stored at /v3/channels/shared/storage/tables
// DatablockStorage.copyStaticTable = function (tableName, onSuccess, onError) {
// // We don't differentiate between static and current shared tables
// // they are both just pointers to the 'shared' channel's tables.
// _fetch('add_shared_table', 'POST', {
// table_name: tableName,
// }).then(onSuccess, onError);
// };