Frontend improvements for Databases plugin

Summary:
Specs here: https://fb.quip.com/aPPOAWMraRMT

Screenshots:
https://pxl.cl/Gngf
https://pxl.cl/Gngg
https://pxl.cl/Gngd
https://pxl.cl/GxQr
https://pxl.cl/Gngh
https://pxl.cl/Gngk
https://pxl.cl/Gngl
https://pxl.cl/Gngm

Reviewed By: quanturium

Differential Revision: D16266093

fbshipit-source-id: a5408b974875dcabcbd6055ccbb2818d0c1b25f6

src/plugins/databases/ClientProtocol.js

@@ -48,6 +48,28 @@ type GetTableStructureResponse = {
   definition: string,
 };
 
+type ExecuteSqlRequest = {
+  databaseId: number,
+  value: string,
+};
+
+type ExecuteSqlResponse = {
+  type: string,
+  columns: Array<string>,
+  values: Array<Array<Value>>,
+  insertedId: number,
+  affectedCount: number,
+};
+
+type GetTableInfoRequest = {
+  databaseId: number,
+  table: string,
+};
+
+type GetTableInfoResponse = {
+  definition: string,
+};
+
 export class DatabaseClient {
   client: PluginClient;
 
@@ -67,4 +89,12 @@ export class DatabaseClient {
     GetTableStructureRequest,
     GetTableStructureResponse,
   > = params => this.client.call('getTableStructure', params);
+
+  getExecution: ClientCall<ExecuteSqlRequest, ExecuteSqlResponse> = params =>
+    this.client.call('execute', params);
+
+  getTableInfo: ClientCall<
+    GetTableInfoRequest,
+    GetTableInfoResponse,
+  > = params => this.client.call('getTableInfo', params);
 }