feat(manager/gradle): add support for Groovy and Kotlin maps

[Churro]

Changes

Adds support for map collections up to 3rd-level nesting.

• Support for Groovy maps, e.g.

  var versions = [
    graphqlJava          : "18.0",
    guava                : "com.google.guava:guava:31.1-jre",
    android: [
      buildTools         :  "30.0.3"
    ],
  ]

• Support for Kotlin's mapOf collections, e.g.

  extra["deps"] = mapOf(
    "support" to mapOf(
      "appCompat" to "com.android.support:appcompat-v7:26.0.2",
      "junit" to mapOf(
        "jupiter" to "5.0.1"
      )
    )
  )

Implementation Notes

• The parser code stacks the same matching code multiple times. This is done to propertly keep track of the hierarchy, e.g. deps -> deps.support -> deps.support.junit. The limitation of max. three levels was deliberately chosen to keep the code neat (while being still real-world friendly) but could be expanded, if needed.
• Changes in handler.ts were made to match situations, where the map entry contains a string value that requires interpolation, e.g.

  ext.deps = [
    kotlinPlugin: "org.jetbrains.kotlin:kotlin-gradle-plugin:${versions.kotlin}"
  ]

kotlinPlugin is not added as a variable then as this would result in indirect variable references (varA: "someother$varB"). This is just an explanation, no limitation - this is the same behavior for simple, single variables already as well.

Context

• Closes Support map variables in Gradle parser #18091
• Closes Resolve dynamic deps versions in gradle #15359
• Closes Spotbugs library and plugin versions mixed up #13619

Real-world examples that previously (= until this PR) didn't match at all:

• https://github.com/apache/kafka/blob/trunk/gradle/dependencies.gradle
• https://github.com/godotengine/godot/blob/master/platform/android/java/app/config.gradle
• https://github.com/square/picasso/blob/master/build.gradle
• https://github.com/MinnDevelopment/discord-webhooks/blob/master/build.gradle.kts

Documentation (please check one with an [x])

• I have updated the documentation, or
• No documentation update is required

How I've tested my work (please tick one)

I have verified these changes via:

• Code inspection only, or
• Newly added/modified unit tests, or
• No unit tests but ran on a real repository, or
• Both unit tests + ran on a real repository

Test repository (= minimal reproduction from #13619):

• Update java renovate-demo/13619#1

Logs

"gradle": [
 {"packageFile": "settings.gradle", "datasource": "maven", "deps": []},
 {
   "packageFile": "build.gradle",
   "datasource": "maven",
   "deps": [
     {
       "depType": "plugin",
       "depName": "com.github.ben-manes.versions",
       "packageName": "com.github.ben-manes.versions:com.github.ben-manes.versions.gradle.plugin",
       "registryUrls": [
         "https://plugins.gradle.org/m2/",
         "https://repo.maven.apache.org/maven2",
         "https://repo.spring.io/plugins-release/"
       ],
       "commitMessageTopic": "plugin com.github.ben-manes.versions",
       "currentValue": "0.40.0",
       "managerData": {
         "fileReplacePosition": 230,
         "packageFile": "build.gradle"
       },
       "fileReplacePosition": 230,
       "depIndex": 0,
       "updates": [
         {
           "bucket": "non-major",
           "newVersion": "0.44.0",
           "newValue": "0.44.0",
           "releaseTimestamp": "2022-11-27T18:25:12.000Z",
           "newMajor": 0,
           "newMinor": 44,
           "updateType": "minor",
           "branchName": "renovate/java-java"
         }
       ],
       "warnings": [],
       "versioning": "gradle",
       "currentVersion": "0.40.0",
       "isSingleVersion": true,
       "fixedVersion": "0.40.0"
     },
     {
       "depType": "plugin",
       "depName": "com.github.spotbugs",
       "packageName": "com.github.spotbugs:com.github.spotbugs.gradle.plugin",
       "registryUrls": [
         "https://plugins.gradle.org/m2/",
         "https://repo.maven.apache.org/maven2",
         "https://repo.spring.io/plugins-release/"
       ],
       "commitMessageTopic": "plugin com.github.spotbugs",
       "currentValue": "5.0.3",
       "managerData": {
         "fileReplacePosition": 274,
         "packageFile": "build.gradle"
       },
       "fileReplacePosition": 274,
       "depIndex": 1,
       "updates": [
         {
           "bucket": "non-major",
           "newVersion": "5.0.13",
           "newValue": "5.0.13",
           "releaseTimestamp": "2022-11-27T16:08:15.000Z",
           "newMajor": 5,
           "newMinor": 0,
           "updateType": "patch",
           "branchName": "renovate/java-java"
         }
       ],
       "warnings": [],
       "versioning": "gradle",
       "currentVersion": "5.0.3",
       "isSingleVersion": true,
       "fixedVersion": "5.0.3"
     }
   ]
 },
 {
   "packageFile": "gradle/dependencies.gradle",
   "datasource": "maven",
   "deps": [
     {
       "depName": "com.github.spotbugs:spotbugs-annotations",
       "currentValue": "4.5.2",
       "managerData": {
         "fileReplacePosition": 181,
         "packageFile": "gradle/dependencies.gradle"
       },
       "groupName": "versions.spotbugs_annotations_version",
       "fileReplacePosition": 181,
       "registryUrls": [
         "https://plugins.gradle.org/m2/",
         "https://repo.maven.apache.org/maven2",
         "https://repo.spring.io/plugins-release/"
       ],
       "depType": "dependencies",
       "depIndex": 0,
       "updates": [
         {
           "bucket": "non-major",
           "newVersion": "4.7.3",
           "newValue": "4.7.3",
           "releaseTimestamp": "2022-10-17T05:06:37.000Z",
           "newMajor": 4,
           "newMinor": 7,
           "updateType": "minor",
           "branchName": "renovate/java-java"
         }
       ],
       "warnings": [],
       "versioning": "gradle",
       "sourceUrl": "https://github.com/spotbugs/spotbugs",
       "homepage": "https://spotbugs.github.io/",
       "currentVersion": "4.5.2",
       "isSingleVersion": true,
       "fixedVersion": "4.5.2"
     }
   ]
 }
],

[viceice]

otherwise LGTM

[renovate-release]

🎉 This PR is included in version 34.41.0 🎉

The release is available on:

• GitHub release
• 34.41.0

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