feat: added new execCommand method

[rmarchet]

Description

Add new execCommand method

Motivation and Context

Implement a way to send commands to the SDK frontend to control its UI elements

Usage examples

import BeePLugin from '@beefree.io/sdk'

const beePlugin = new BeePlugin()
try {
  const res = await beePlugin.execCommand('select', { target: { uuid: 'xxxxx-xxxxx-xxxxx' } })
} catch (error) {
  // ...
}

Types of changes

• new method execCommand
• new TS types for execCommand and its arguments

[github-actions]

Code Coverage Report

Coverage after merging feat/exec-command into master

83.53%

Coverage Report

File	Branches	Funcs	Lines	Uncovered Lines
src
index.ts	60%	5.77%	58.43%	..., 90, 91, 96, 97
src/services
api.ts	100%	50%	100%
axios.ts	100%	100%	100%
src/types
bee.ts	100%	100%	100%
src/utils
Constants.ts	100%	100%	100%
utils.ts	0%	0%	73.33%	..., 8, 8, 8, 8