Fix/issue 80 save as template type

[davidesamp]

Description

• Changed onSaveAsTemplate json parameter type from Record<String, unknown> to string .
• Changed FileSaved cdn url with a working one.

Motivation and Context

Close https://github.com/BEE-Plugin/Bee-plugin-official/issues/80

Usage examples

import BeePLugin from '@mailupinc/bee-plugin'

const template = {....}

const beeConfig :IBeeConfig = {
  uid: 'test1-clientside',
  container: 'bee-plugin-container',
  onSaveAsTemplate: (json) => void save('newsletter-template.json', json),
  ...
}

const beePlugin = new BeePlugin()
beePlugin.getToken().then(() => {
    beePlugin.start(beeConfig, template, '', { shared: false })
})

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] 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 fix/issue-80-saveAsTemplate-type into master

84.00%

Coverage Report

File	Branches	Funcs	Lines	Uncovered Lines
src
index.ts	50%	7.89%	61.97%	..., 93, 94, 98, 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%	70.59%	..., 8, 8, 9, 9