feature: Set environment variables for DAP configuration #280

Did you check the docs?

• I have read all the docs

Is your feature request related to a problem? Please describe.

vscode-java-debug accepts all the same parameters as vscode’s launch.json. I have an app that depends on environment variables being set properly to execute but it appears the only user configuration available in nvim-java are profiles that accept VM and program args.

Describe the solution you'd like

Either Profile UI should accept and write a map of environment variables to the DAP configuration for Java or nvim-java should be able to read from a .vscode/launch.json as explained in the nvim-dap help.

Describe alternatives you've considered

nvim-jdtls auto-generates a minimal .vscode/launch.json but its unclear in that project how to use it to override its automatic configuration.

Additional context

No response