feat(Mattermost Node): Add support for Channel Search (#2687)

* Squashed commit of the following:

commit 9f76bdca9b4af4fd3ee429d1c381c3ed5529434c
Author: Matt Walther <matt@mashio.net>
Date:   Sun Jan 16 16:40:34 2022 -0600

    Mattermost Channel Search

* Add more boilerplate so Search action renders

* Changed order of search to make the operations alphabetical

* ⚡ Add pagination

Co-authored-by: Jonathan Bennetts <jonathan.bennetts@gmail.com>
Co-authored-by: ricardo <ricardoespinoza105@gmail.com>

packages/nodes-base/nodes/Mattermost/v1/actions/channel/search/description.ts

@@ -0,0 +1,88 @@
+import {
+	ChannelProperties,
+} from '../../Interfaces';
+
+export const channelSearchDescription: ChannelProperties = [
+	{
+		displayName: 'Team ID',
+		name: 'teamId',
+		type: 'options',
+		typeOptions: {
+			loadOptionsMethod: 'getTeams',
+		},
+		options: [],
+		default: '',
+		required: true,
+		displayOptions: {
+			show: {
+				operation: [
+					'search',
+				],
+				resource: [
+					'channel',
+				],
+			},
+		},
+		description: 'The Mattermost Team.',
+	},
+	{
+		displayName: 'Search Term',
+		name: 'term',
+		type: 'string',
+		default: '',
+		placeholder: 'General',
+		displayOptions: {
+			show: {
+				operation: [
+					'search',
+				],
+				resource: [
+					'channel',
+				],
+			},
+		},
+		required: true,
+		description: 'The search term for Channels in a Team',
+	},
+	{
+		displayName: 'Return All',
+		name: 'returnAll',
+		type: 'boolean',
+		default: false,
+		description: 'Whether to return all results',
+		displayOptions: {
+			show: {
+				operation: [
+					'search',
+				],
+				resource: [
+					'channel',
+				],
+			},
+		},
+	},
+	{
+		displayName: 'Limit',
+		name: 'limit',
+		type: 'number',
+		default: 100,
+		description: 'The number of results to return',
+		typeOptions: {
+			minValue: 1,
+			maxValue: 100,
+		},
+		displayOptions: {
+			show: {
+				operation: [
+					'search',
+				],
+				resource: [
+					'channel',
+				],
+				returnAll: [
+					false,
+				],
+			},
+		},
+	},
+];