feat(math): new math package and useProjection function

[Kingwl]

No description provided.

[wheatjs]

Interesting, a few things I'd like to mention. In VueUse we prefer to return an object rather than an array. Secondly I've noticed you've created a couple PR's (#1223) for math related functions. I'm wondering if we would rather have a @vueuse/math library as some of the names might confuse users thinking it is something else. @antfu any input on a new package for these types of functions?

[Kingwl]

I'm Ok with that. Would you mind tell me what should I do?

[antfu]

Let's have a @vueuse/math then. Anyone interested in it feel free to kickstart it and send a PR

[Kingwl]

I'm not a big fan about @vueuse/math:

1. Currently, other packages all have third party dependencies (electron, firebase, etc). But the Math does not.
2. If we have /math, why don't we have something like /events, /convertion, /encoding, or something like that ? It's seems a bit overkill.

How about just a new category called Math?

[wheatjs]

We have @vueuse/shared and @vueuse/components which have the same dependencies as @vueuse/core. The reason I think it is a good idea is that both the PR's you have opened useSlidingWindow and useProjection have names that people might confuse as other functions. If they are under a math package it will be more clear and we will be less likely to run into similar confusion or possible conflicts in the future

[Kingwl]

Have create a new package /math.

[Kingwl]

ping 👀

[wheatjs]

Sorry I've been pretty busy recently so I haven't had as much time to review PRs. This looks good to me though!