Rewrite plugin using http client mixin

[dyladan]

Parts of this rewrite come from https://github.com/logstash-plugins/logstash-output-http

Uses https://github.com/logstash-plugins/logstash-mixin-http_client

[dyladan]

Looks like the ssl_verification_mode option for logstash-mixin-http_client was only introduced in 7.1.0, which means that the option will have no effect in any version of logstash which provides a lower version of the mixin than that. It looks like that means the option will only work in logstash >= 8.1.0. In previous versions, the SSL verification cannot be turned off. 8.1.0 was released just over a year ago.

I suggest that we move forward with this change, but document that in order to use the ssl_verify_none option with a version of logstash older than 8.1.0, version 0.3.2 of this plugin must be used.

[pirgeo]

Putting my approval here mainly for the wording parts, I do not have enough Ruby experience to review this thoroughly.

[sonarcloud[bot]]

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