Double-tap zoom scale

[iazel]

Description

Introduce a new parameter to allow library users to modify how much an image will be zoomed in on double tap.

We have also exposed minScale and maxScale on the main entry-point showImageViewer.

Type

What kind of change does this pull request introduce?

[ ] Bug fix
[x] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Build related changes
[ ] CI related changes
[x] Documentation content changes
[ ] Other (please describe below)

Breaking Changes

Does this pull request introduce any breaking changes?

[ ] Yes
[x] No

Other Information

Tests already cover this use case

[iazel]

Looks like I was too hasty with the PR, there is a bug, I'll open it again once I fix it

[iazel]

Fixed, now double tap to zoom works as expected