Add kotlin-faker to extensions list (#3971)

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Hi,
I've been using kotest for many years now, and thought it would be nice
to contribute to the kotest community by providing an extension for
kotest property testing, which allows one to generate even a larger
variety of data than the built-in Arbs.

Should I also update other versions of the docs? Which ones?

Also maybe you want to consider adding a link to the extension somewhere
in kotest property docs? E.g.
https://kotest.io/docs/proptest/property-test-extra-arbs.html

---------

Co-authored-by: Emil Kantis <emil.kantis@protonmail.com>

documentation/docs/extensions/index.md

@@ -33,6 +33,7 @@ maintained and hosted by third parties.
 | [H2 Database Extension](https://github.com/LeoColman/kotest-extensions-h2)                       | H2 Database integration with Kotest                                                |
 | [Http4k](https://www.http4k.org/guide/reference/kotest/)                                         | Functional toolkit for Kotlin HTTP applications                                    |
 | [Kotless](https://github.com/LeoColman/kotest-kotless)                                           | Utilties for kotless and kotest                                                    |
+| [KotlinFaker](https://serpro69.github.io/kotlin-faker/extensions/kotest-property-extension/)     | Kotlin-faker data generation extensions for Kotest Property Testing                |
 | [KotlinFixture](https://github.com/appmattus/kotlinfixture/blob/main/fixture-kotest/README.adoc) | generate well-defined, but essentially random, input                               |
 | [LogCapture](https://github.com/jsalinaspolo/logcapture)                                         | LogCapture is a testing library for asserting logging messages                     |
 | [Micronaut](https://github.com/micronaut-projects/micronaut-test)                                | JVM-based, full-stack framework for building modular, easily testable microservice |

documentation/versioned_docs/version-5.8/extensions/index.md

@@ -33,6 +33,7 @@ maintained and hosted by third parties.
 | [H2 Database Extension](https://github.com/LeoColman/kotest-extensions-h2)                       | H2 Database integration with Kotest                                                |
 | [Http4k](https://www.http4k.org/guide/reference/kotest/)                                         | Functional toolkit for Kotlin HTTP applications                                    |
 | [Kotless](https://github.com/LeoColman/kotest-kotless)                                           | Utilties for kotless and kotest                                                    |
+| [KotlinFaker](https://serpro69.github.io/kotlin-faker/extensions/kotest-property-extension/)     | Kotlin-faker data generation extensions for Kotest Property Testing                |
 | [KotlinFixture](https://github.com/appmattus/kotlinfixture/blob/main/fixture-kotest/README.adoc) | generate well-defined, but essentially random, input                               |
 | [LogCapture](https://github.com/jsalinaspolo/logcapture)                                         | LogCapture is a testing library for asserting logging messages                     |
 | [Micronaut](https://github.com/micronaut-projects/micronaut-test)                                | JVM-based, full-stack framework for building modular, easily testable microservice |