feat(v2): add time prediction in the description of a post blog

[fanny]

🚀 Feature

In our blog plugin, it can be in interesting adds a time prevision of blog post.

Have you read the Contributing Guidelines on issues?

yes

Motivation

Its very common in modern web blogs(some examples are: medium; dev.to and etc), to have the time prediction in the description

Pitch

(Please explain why this feature should be implemented and how it would be used.)

It's a factor that many readers, consider it before deep dive in a blog post, so would it be nice to have here in docusaurus.

[yangshun]

Yes! Sounds good, this can be an option on the blog plugin 😄

[lex111]

@yangshun do we really want to include this in core? Or will it be done as a plugin?

[yangshun]

It'll be in the blog plugin, not Docusaurus core. We don't have a good way of augmenting data to plugins at the moment.

[fanny]

Yeah, I was thinking in a extension for @docusaurus-plugin-content-blog

[JoseRenan]

Hi! I'm a first-time contributor on docusaurus, could I work on this issue?