add support for FlatESLint

[adrian-gierakowski]

provide support FlatESLint config format

Currently, when running eslint from command line, I'm able to use the new config format by setting ESLINT_USE_FLAT_CONFIG=true env var, however it does not work when ran via typescript-eslint-language-service, even if I start my code editor from a shell in which ESLINT_USE_FLAT_CONFIG is exported

for more details about the new config format see:
https://eslint.org/blog/2022/08/new-config-system-part-1
https://eslint.org/blog/2022/08/new-config-system-part-2
https://eslint.org/blog/2022/08/new-config-system-part-3
eslint/eslint#13481