[MM-53968] Includes mattermost-plugin-api into the mono repo (#24235)

Include https://github.com/mattermost/mattermost-plugin-api into the mono repo

Co-authored-by: Jesse Hallam <jesse.hallam@gmail.com>
Co-authored-by: Michael Kochell <mjkochell@gmail.com>
Co-authored-by: Alejandro García Montoro <alejandro.garciamontoro@gmail.com>
Co-authored-by: Ben Schumacher <ben.schumacher@mattermost.com>
Co-authored-by: Alex Dovenmuehle <alex.dovenmuehle@mattermost.com>
Co-authored-by: Michael Kochell <6913320+mickmister@users.noreply.github.com>
Co-authored-by: Christopher Poile <cpoile@gmail.com>
Co-authored-by: İlker Göktuğ Öztürk <ilkergoktugozturk@gmail.com>
Co-authored-by: Shota Gvinepadze <wineson@gmail.com>
Co-authored-by: Ali Farooq <ali.farooq0@pm.me>
Co-authored-by: Maria A Nunez <maria.nunez@mattermost.com>
Co-authored-by: Daniel Espino García <larkox@gmail.com>
Co-authored-by: Christopher Speller <crspeller@gmail.com>
Co-authored-by: Alex Dovenmuehle <adovenmuehle@gmail.com>
Co-authored-by: Szymon Gibała <szymongib@gmail.com>
Co-authored-by: Lev <1187448+levb@users.noreply.github.com>
Co-authored-by: Jason Frerich <jason.frerich@mattermost.com>
Co-authored-by: Agniva De Sarker <agnivade@yahoo.co.in>
Co-authored-by: Artur M. Wolff <artur.m.wolff@gmail.com>
Co-authored-by: Madhav Hugar <16546715+madhavhugar@users.noreply.github.com>
Co-authored-by: Joe <security.joe@pm.me>
Co-authored-by: Ibrahim Serdar Acikgoz <serdaracikgoz86@gmail.com>
Co-authored-by: José Peso <trilopin@users.noreply.github.com>

server/public/pluginapi/client.go

@@ -0,0 +1,79 @@
+package pluginapi
+
+import (
+	"github.com/blang/semver/v4"
+	"github.com/mattermost/mattermost/server/public/plugin"
+	"github.com/pkg/errors"
+)
+
+// Client is a streamlined wrapper over the mattermost plugin API.
+type Client struct {
+	api plugin.API
+
+	Bot           BotService
+	Channel       ChannelService
+	Cluster       ClusterService
+	Configuration ConfigurationService
+	SlashCommand  SlashCommandService
+	OAuth         OAuthService
+	Emoji         EmojiService
+	File          FileService
+	Frontend      FrontendService
+	Group         GroupService
+	KV            KVService
+	Log           LogService
+	Mail          MailService
+	Plugin        PluginService
+	Post          PostService
+	Session       SessionService
+	Store         *StoreService
+	System        SystemService
+	Team          TeamService
+	User          UserService
+}
+
+// NewClient creates a new instance of Client.
+//
+// This client must only be created once per plugin to
+// prevent reacquiring of resources.
+func NewClient(api plugin.API, driver plugin.Driver) *Client {
+	return &Client{
+		api: api,
+
+		Bot:           BotService{api: api},
+		Channel:       ChannelService{api: api},
+		Cluster:       ClusterService{api: api},
+		Configuration: ConfigurationService{api: api},
+		SlashCommand:  SlashCommandService{api: api},
+		OAuth:         OAuthService{api: api},
+		Emoji:         EmojiService{api: api},
+		File:          FileService{api: api},
+		Frontend:      FrontendService{api: api},
+		Group:         GroupService{api: api},
+		KV:            KVService{api: api},
+		Log:           LogService{api: api},
+		Mail:          MailService{api: api},
+		Plugin:        PluginService{api: api},
+		Post:          PostService{api: api},
+		Session:       SessionService{api: api},
+		Store: &StoreService{
+			api:    api,
+			driver: driver,
+		},
+		System: SystemService{api: api},
+		Team:   TeamService{api: api},
+		User:   UserService{api: api},
+	}
+}
+
+func ensureServerVersion(api plugin.API, required string) error {
+	serverVersion := api.GetServerVersion()
+	currentVersion := semver.MustParse(serverVersion)
+	requiredVersion := semver.MustParse(required)
+
+	if currentVersion.LT(requiredVersion) {
+		return errors.Errorf("incompatible server version for plugin, minimum required version: %s, current version: %s", required, serverVersion)
+	}
+
+	return nil
+}