chore: added custom attributes type

[davidesamp]

Description

• Added custom attributes type to ClientConfig
• Added custom attributes content dialog type to ClientConfig

Motivation and Context

Align typing with documentation https://docs.beefree.io/beefree-sdk/other-customizations/advanced-options/custom-attributes

Usage examples

import BeefreeSDK from '@beefree.io/sdk'
import { CustomAttributes, IBeeConfig, IEntityContentJson } from '@beefree.io/sdk/dist/types/bee'

const customAttributes: CustomAttributes = {
 //You can also add only enableOpenFields option to basic use
 //enableOpenFields: true,
  attributes: [ 
    {
      key: "data-country",
      value: ['us', 'italy', 'france', 'germany'],
      target: "link"
    },
    {
      key: "Deeplink",
      value: true,
      target: "link"
    },
    {
      key: "data-segment",
      value: ['travel', 'luxury'],
      target: "link"
    },
    {
      key: "data-descriptor",
      value: "",
      target: "link"
    },
    {
      key: "data-campaign",
      value: ['ua001', 'ua002'],
      target: "link"
    },
    {
      key: "class",
      target: "tag"
    }
  ]
}

const beeConfig :IBeeConfig = {
 uid: 'test1-clientside',
 container: 'bee-plugin-container',
 customAttributes,
....
}

const yourTemplate: IEntityContentJson = {...}
const sdk = new BeefreeSDK()
sdk.getToken('your-client-id', 'your-client-secrets').then(() => {
   sdk.start(beeConfig, yourTemplate, )
})

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

[github-actions[bot]]

Code Coverage Report

Coverage after merging type/customAttributes into master

81.94%

Coverage Report

File	Branches	Funcs	Lines	Uncovered Lines
src
index.ts	60%	5.88%	57.95%	..., 85, 95, 96, 99
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