[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>
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Co-authored-by: Shota Gvinepadze <wineson@gmail.com>
Co-authored-by: Ali Farooq <ali.farooq0@pm.me>
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Co-authored-by: Daniel Espino García <larkox@gmail.com>
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Co-authored-by: Jason Frerich <jason.frerich@mattermost.com>
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Co-authored-by: Ibrahim Serdar Acikgoz <serdaracikgoz86@gmail.com>
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server/public/pluginapi/experimental/bot/bot.go

@@ -0,0 +1,53 @@
+// Copyright (c) 2019-present Mattermost, Inc. All Rights Reserved.
+// See License for license information.
+
+package bot
+
+import (
+	"github.com/pkg/errors"
+
+	"github.com/mattermost/mattermost/server/public/model"
+	"github.com/mattermost/mattermost/server/public/pluginapi"
+)
+
+type Bot interface {
+	Ensure(stored *model.Bot, iconPath string) error
+	MattermostUserID() string
+	String() string
+}
+
+type bot struct {
+	botService       pluginapi.BotService
+	mattermostUserID string
+	displayName      string
+}
+
+func New(botService pluginapi.BotService) Bot {
+	newBot := &bot{
+		botService: botService,
+	}
+	return newBot
+}
+
+func (bot *bot) Ensure(stored *model.Bot, iconPath string) error {
+	if bot.mattermostUserID != "" {
+		// Already done
+		return nil
+	}
+
+	botUserID, err := bot.botService.EnsureBot(stored, pluginapi.ProfileImagePath(iconPath))
+	if err != nil {
+		return errors.Wrap(err, "failed to ensure bot account")
+	}
+	bot.mattermostUserID = botUserID
+	bot.displayName = stored.DisplayName
+	return nil
+}
+
+func (bot *bot) MattermostUserID() string {
+	return bot.mattermostUserID
+}
+
+func (bot *bot) String() string {
+	return bot.displayName
+}