Add slot attribute to JsxDom props

[hellos3b]

This adds the slot attribute to the JsxDom props which is commonly used in web component libraries that use the shadow dom.

MDN Reference

https://developer.mozilla.org/en-US/docs/Web/HTML/Reference/Global_attributes/slot

Sample

<div slot="content">
  <MyReactComponent/>
</div>

Workaround

Have been using this as a workaround for a while before I realized I can contribute myself

module Slot = {
  @react.component
  let make = (~children: React.element, ~slot: string) =>
    React.cloneElement(children, Obj.magic({"slot": slot}))
}

<Slot slot="content">
  <div>
    <MyReactComponent/>
  </div>
</Slot>

[nojaf]

Hello, thanks for this contribution!

Could you run:

make lib
make build
make test-analysis

to update the failing test!

[hellos3b]

@nojaf Dang yeah thought I could get away with git editor. Will get things set up and do it more properly

[nojaf]

No worries! Just a quick tip for next time: please use a different branch for your PR if possible. I fixed this locally, but I wasn't able to push to your branch since it is the default one.

[hellos3b]

@nojaf I may need to resubmit off a new branch, went through CONTRIBUTION.md but having trouble with the make commands -- any chance you recognize this error

> python --version
Python 3.11.0
> opam --version
2.3.0
> make lib
./scripts/buildRuntime.sh
TypeError: Cannot read properties of undefined (reading 'toString')
    at acquireBuild (file:///www.github.com/rescript-compiler/cli/common/bsb.js:57:53)
    at delegate (file:///www.github.com/rescript-compiler/cli/common/bsb.js:76:12)
    at Module.clean (file:///www.github.com/rescript-compiler/cli/common/bsb.js:112:3)
    at file:///www.github.com/rescript-compiler/cli/rescript.js:111:11
    at ModuleJob.run (node:internal/modules/esm/module_job:274:25)
    at async onImport.tracePromise.__proto__ (node:internal/modules/esm/loader:644:26)
    at async asyncRunEntryPointWithESMLoader (node:internal/modules/run_main:98:5)
Error: spawn /www.github.com/rescript-compiler/darwinarm64/rescript.exe ENOENT
make: *** [lib] Error 2

// @
fs.writeFileSync(lockFileName, ownerProcess.pid.toString(), {