LSP-ESLint: add new fields to lsp-eslint--configuration

[NdYAG]

More details can be found in this issue:
#4091

Currently the vscode-eslint has added some new configuration, including

• eslint.problems.shortenToSingleLine: (@SInCE 2.3.0) - Shortens the text spans of underlined problems to their first related line.
• eslint.experimental.useFlatConfig: (@SInCE 2.3.0) - Enables support of experimental Flat Config (aka eslint.config.js, supported by ESLint version 8.21 or later)
• eslint.timeBudget.onValidation (@SInCE 2.3.5) - controls the time budget that can be used for validation before a warning or an error is shown.
• eslint.timeBudget.onFixes (@SInCE 2.3.5) - controls the time budget that can be used to compute fixes before a warning or an error is shown.

See: https://github.com/microsoft/vscode-eslint/blob/main/README.md

This PR is to add some custom variables for the eslintServer so that it won't break.

[rajasegar]

when this will be merged