Enable lazy loading optional parameter

[trekie86]

If the feature request is for a plugin or theme, specify it here.

plugins in general

If the feature solves a problem you have, specify it here.

When I open my terminal, I want zsh ready to go when I start it. At times, startup was very slow...I'm looking at you NVM, and so I spent some time profiling to figure out the source. There are some of my plugins which I need right away (e.g. ones that set the style), but there are others that can be delayed a bit. It would be nice for zap to support lazy loading out of the box and not rely upon each individual plugin to support it.

Describe the proposed feature.

• Support lazy loading of a plugin
• Provide optional parameter to lazy load a particular plugin

Describe alternatives you've considered

Moving one by one through plugins that are slower to start but not necessary for startup and finding lazy-loading alternatives.

Additional context

No response

Related Issues

Could help address: #174