[bug] fetchModel fails when host and cqPath is passed

[arunpadmasreede]

Describe the bug
fetchModel functions failes to get the model when host and cqPath are passed as the url formed to fetch is incorrect

Package version
v2.1.0

To Reproduce
Steps to reproduce the behavior:

1. invoke fetchModel({
   cqPath,
   host
   })
   where cqPath can be any path which can give json
   and host where this can be used
   example : fetch('https:/api.mockfly.dev/mocks/1a7495c9-1442-415f-b55c-5f5b3a2ed5f4/my-iqos-header.model.json')

Expected behavior
The fetch url should be correctly formed and work as expected to download json
in fetchModel.ts at line 58
const hostURL = sanitizeUrl(${host}/${path}).replace(//+/g, '/'); is the one causing the problem of replacing https:// to http:/ and due to which fetch for model.json fails
Better to replace this with
const fullUrl = new URL(cqPath, host).toString(); which gives the correct url

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Additional context
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