nodejs: add tests to library (#7694)

* nodejs: add tests to library

* new tests

* remove message splitting

* fix race

* docs

* replace extract-zip with yauzl that it wraps (high severity issue)

* fix ci tests

* skip server tests on macos and win unless SMP_SERVER is set

* fix win test

* fix win test

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Co-authored-by: Evgeny @ SimpleX Chat <259188159+evgeny-simplex@users.noreply.github.com>

packages/simplex-chat-nodejs/tests/fixtures/tls/server.key

@@ -0,0 +1,4 @@
+-----BEGIN PRIVATE KEY-----
+MEcCAQAwBQYDK2VxBDsEOZcXSjKQ3FQ9EBfqHmFIidOu4LecpUgi5NVPMhx7mS2d
+QNQ0lFasp+EfvLErbs1Sd9xLVxA1hnZJng==
+-----END PRIVATE KEY-----