Add default exports file to generate script (#1)

[franverona]

This PR contains:

• bugfix
• feature
• refactor
• documentation
• other

Description

After many months using the package on several projects, I've found that having one line per import for each icon might be a little bit overwhelming regarding "import maintenance".

With this PR the package will generate an index.ts file with all icons exported as default. Thus, the following snippets are equivalent:

import {
  CloseLineIcon,
  EyeLineIcon,
  EyeOffLineIcon,
  SearchLineIcon
} from 'remixicon-react'

import CloseLineIcon from 'remixicon-react/CloseLineIcon'
import EyeLineIcon from 'remixicon-react/EyeLineIcon'
import EyeOffLineIcon from 'remixicon-react/EyeOffLineIcon'
import SearchLineIcon from 'remixicon-react/SearchLineIcon'

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This change is 

[FelipeQueiroz]

This PR need's to be approved soon as possible, this change is very important for clean codes.

[franverona]

Any chance that this will be merged soon?

[Liam26]

Absolute wildcard here but I really wish we could get this merged in it would be so much better