[REQUEST] Create a lts.json for external users to access all the LTS version details

[SparshithNR]

Is your feature request related to a problem? Please describe.
I was developing a tool that requires knowing what are current ember LTS versions. As I searched around I couldn't find any such resources other than lts page on the website.
I found there will be more cases if we can provide such files and it will be easy to maintain and access.

Describe the solution you'd like
Currently we hard code the LTS details in the controller itself here.

We should provide a lts.json, that will have all the information we display on lts page of the website and this will help if anyone wants to access it.
Sample

[
    {
      version: '4.4',
      promotionDate: 'July 13, 2022',
    },
    {
      version: '3.28',
      promotionDate: December 20, 2021,
    },
]

Describe alternatives you've considered
Alternatively or long-term solution I would like to have a library called ember-lts-versions something like node-lts-versions

[theVJagrawal]

hey @SparshithNR I want to work on this issue, if it is not resolved yet