Read templates from fs.FS to allow for embedding

[gaqzi]

To allow for embedding all the assets into the binary I want to be able
to configure the filesystem html/template reads from.

I'm not sure how to add tests for this since component.go have no direct
tests. To test out the behavior I used replace in the go.mod for the
render example to see that it still worked as expected.

The new embedfs example shows the same example by swapping out the FS
to the embedded one so there's something to show how it's used. :)

I'm happy to add more tests to make it fit the project as this is a bit of a drive by PR since I wanted to solve a problem for me, and hacked it together to test if it could work :D

[gaqzi]

since there's no tagged version I did this to show what it looks like, would have to remove and set to the correct version if this looks good :)

[donseba]

Hey thanks, for the addition . maybe it should have a switch to check if .fs is nil, and not assign a value by default.

that said I have been working on something in parallel that might interest you. https://github.com/donseba/go-partial and more specifically have a look at this PR : donseba/go-partial#14 which is still open.

it also does support the custom filesystem you are looking for.

its basically the components in this htmx repo but with many additions which felt wrong to add to this repo since the main focus of this repo should be just htmx.

[SergeAx]

Wow, I was about to ask for embedded FS support! I wanted to go directly to issues but decided to take a look at PRs first, and here we go :) I would really appreciate merging this!

[donseba]

Ok. Let me make a few changes and I'll add it.