feat: separating non-react specific utils and type definitions into it's own package.

[ValeryG]

Separation of presentation and helper code

Both elements and elements-core are presentation level specific. They depend on react and their bundles they publish have client side polyfills and references to document/window and globalThis. This makes it hard to use code exported from those packages to be used in non-react or ssr running projects.

And there is an excellent code. Eg:

• http-spec is producing AST, but the layer that creates TableOfContent structure is backed into presentation package.
• string definitions to decipher security section are also very helpful on it's own without being tided to react components.
• validations and guards on AST nodes

So the idea of this PR is to introduce new package, elements-utils make it be presentation framework agnostic (no dependency on react, no browser specific code in the bundle), and move the implementation described above into this package. So essentially make it a helper on top of http-spec, and keep elements and elements-core hold presentation level.

• [ X] Read CONTRIBUTING.md

Other Available PR Templates:

• Release: https://github.com/stoplightio/elements/compare?template=release.md
  • [X] Read the release section of CONTRIBUTING.md

TODO:

as new package @stoplight/elements-utls is not published, there are some temperately changes introduced to prevent CI from failing. Those changes needed to be rolled back after package is published:

• remove post install step from package.json

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