feat: Add support for gradle's kotlin-dsl

[pastjean]

• Ready for review
• Follows CONTRIBUTING rules
• Reviewed by Snyk internal team

What does this PR do?

As of gradle v5 (soon to be released), kotlin-dsl is now official. It still uses the
same old methods as gradle but the detection of those project with
snyk was broken. This patch adds the support for gradle kotlin-dsl

How should this be manually tested?

Create a build.gradle.kts file in a directory with the following content:

plugins {
    kotlin("jvm")
}

dependencies {
    implementation(kotlin("stdlib"))
}

Any background context you want to provide?

Kotlin-dsl: https://github.com/gradle/kotlin-dsl/

News here: https://github.com/gradle/gradle/releases/tag/v5.0.0-RC2#kotlin-dsl-1.0

[CLAassistant]

All committers have signed the CLA.

[pastjean]

@michael-go , 1st sorry for the random ping,

How can I ensure this gets someone from snyk's approval ?

[michael-go]

Hi @pastjean 👋 😄
There was already some discussion about your PR in Snyk's Slack :) Will make an effort to ping the team.
Thanks! 🙇

[pastjean]

Thanks for the quick answer. 🙌

[pastjean]

@tbroyer is everything good now ? Or do I need more

[lili2311]

Hi! Just to keep you updated this is on my teams radar, there is some upstream work needed to make this mergeable which we are working on :)

I see some tests are failing, kicked off the build again seems like a fluke

[Kirill89]

Tests are broken because travis not pass private environment variables to forked code.
I created different PR and merged your code into it.
@pastjean thank you for your help!