spec-assertion-thrown? improvements

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Problem statement

Currently no cljs option exists for this assert expression and the impl isn't bound by specs.

Task

• add check! around impl.spec-assertion-thrown?; note this issue in a previous attempt: #55 (comment)
• A cljs equivalent.
• Expand unit.nedap.utils.speced.spec-assertion to also span remaining spec format (e.g. ^{::speced/spec x})

Alternatives and comparison

1. A pure-fn alternative which returns true/false and works within is
   • might be able to leverage thrown?
2. An extension of cljs.test' assert-expr.
   • tricky to implement; notice previous attempt; https://github.com/nedap/utils.spec/pull/55#issuecomment-498690116
   • assert-expr expects an additional first argument over the clj-impl.
   • most clean implementation