support `cwd`, `env` and `envFile` parameters using sun jdi

[NecroKote]

Shameless copy of #45 (Huge thanks to @thunderz99 !)

Code is updated with latest main, is tiny bit cleaner and contains no external dependencies compared to original by thunderz99.

One noticeable change is envs is renamed as env to comply with other debug extensions.

Also, added support for envFile. Empty lines, and lines starting with # are ignored. Contents of env takes precedence over envFile.

[fwcd]

Nice, thanks for having a go at this! Hope to find some time to review this in detail soon

[ihsancemil]

What happened to this mr? cwd parameter would be fantastic