aion_fastvm Gradle transition

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Description

Please include a brief summary of the change that this pull request proposes. Include any relevant motivation and context. List any dependencies required for this change.

This is part of three PRs that should be pushed together
- aion: https://github.com/aionnetwork/aion/pull/647
- aion_api: https://github.com/aionnetwork/aion_api/pull/39
- aion_fastvm: https://github.com/aionnetwork/aion_fastvm/pull/25
This is for migrating from ant to Gradle. Some changes:
- module-info.java wasn't being used correctly before, this is fixed, which breaks the ant build scripts
- In pack's .tar.bz2, 'mod' and 'lib' directory replaced by 'jar' directory
- Jenkinsfile updated
- 'build' target by default now runs some of the unit tests (if this is too slow we can remove them)
Most of the functionality from the ant scripts have been migrated, except the following (will be done in later PR):
- In pack build, can't build solidity and fastvm from source (always downloads from git)
- Bug when downloading solidity and fastvm from git -- it always downloads even if file is present already
- For aion_api, can't build dependent Aion mod jars from kernel's source ("sourcebuild")
Importing in IntelliJ:
- If you decide to open this in IntelliJ, you should clone this to a whole new directory beforehand, otherwise importing it can overwrite your .iml files
- Go to File -> New -> Project from Existing Sources and find your aion directory
- Choose 'Import project from external model' then 'Gradle'
- Check 'Use auto import' and then click Finish
Ant to Gradle translations:

general

ant	gradle
`ant build`	`./gradlew build` (runs some tests) or `./gradlew build -x test` to force skipping all tests
`ant clean`	`./gradlew clean`
`ant test`	`./gradlew test`
`cd modSomething && ant build` (building single module)	`./gradlew modSomething:build` from root project

_aionapi-specific

ant	gradle
`ant clean_build`	`./gradlew build`
`ant javadoc`	`./gradlew javadoc`
`ant clean_build_from_kernel`	coming soon

Don't have an equivalent to the following ant targets because they don't seem to be used directly much (can revisit if this changes). The main use case seems to be just to call clean_build which compiles and creates the pack directory and .tar.gz for distribution.
- build
- build_fatjar
- copy-deps

aion

ant	gradle
`ant pack_build`	`./gradlew pack`

Fixes Issue # .

Type of change

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[ ] Bug fix.
[ ] New feature.
[ ] Enhancement.
[ ] Unit test.
[ ] Breaking change (a fix or feature that causes existing functionality to not work as expected).
[ ] Requires documentation update.

Testing

Please describe the tests you used to validate this pull request. Provide any relevant details for test configurations as well as any instructions to reproduce these results.

Verification

Insert x into the following checkboxes to confirm (eg. [x]):

[x] I have self-reviewed my own code and conformed to the style guidelines of this project.
[x] New and existing tests pass locally with my changes.
[ ] I have added tests for my fix or feature.
[ ] I have made appropriate changes to the corresponding documentation.
[ ] My code generates no new warnings.
[ ] Any dependent changes have been made.

aionnetwork / aion_fastvm