(core) Add attachment and data size usage

Summary:
Adds attachment and data size to the usage section of
the raw data page. Also makes in-document usage banners
update as user actions are applied, causing them to be
hidden/shown or updated based on the current state of
the document.

Test Plan: Browser tests.

Reviewers: jarek

Reviewed By: jarek

Subscribers: alexmojaki

Differential Revision: https://phab.getgrist.com/D3395

app/common/DocUsage.ts

@@ -0,0 +1,29 @@
+import {ApiError} from 'app/common/ApiError';
+
+export interface DocUsage {
+  dataLimitStatus: DataLimitStatus;
+  rowCount: RowCount;
+  dataSizeBytes: DataSize;
+  attachmentsSizeBytes: AttachmentsSize;
+}
+
+type NumberOrStatus = number | 'hidden' | 'pending';
+
+export type RowCount = NumberOrStatus;
+
+export type DataSize = NumberOrStatus;
+
+export type AttachmentsSize = NumberOrStatus;
+
+export type DataLimitStatus = 'approachingLimit' | 'gracePeriod' | 'deleteOnly' | null;
+
+export type NonHidden<T> = Exclude<T, 'hidden'>;
+
+// Ratio of usage at which we start telling users that they're approaching limits.
+export const APPROACHING_LIMIT_RATIO = 0.9;
+
+export class LimitExceededError extends ApiError {
+  constructor(message: string) {
+    super(message, 413);
+  }
+}