fix: unwanted log file creation

[stevenh]

Only create a server log file if requested by: -Dlogging.appender.file.level=<LEVEL>

Change the default server log file name to npm-groovy-lint.log.

Add support for server log file append and flush settings.

Fixes: https://github.com/nvuillam/vscode-groovy-lint/issues/204 https://github.com/nvuillam/vscode-groovy-lint/issues/200

[github-actions[bot]]

🦙 MegaLinter status: ✅ SUCCESS

Descriptor	Linter	Files	Fixed	Errors	Elapsed time
✅ DOCKERFILE	hadolint	1		0	0.09s
✅ GROOVY	npm-groovy-lint	10	2	0	20.38s
✅ JAVASCRIPT	eslint	100	0	0	4.24s
✅ JAVASCRIPT	prettier	100	100	0	5.05s
✅ JSON	eslint-plugin-jsonc	9	0	0	1.64s
✅ JSON	jsonlint	9		0	0.36s
✅ JSON	npm-package-json-lint	yes		no	0.74s
✅ JSON	prettier	9	2	0	1.59s
✅ JSON	v8r	9		0	7.84s
✅ MARKDOWN	markdownlint	7	2	0	4.1s
✅ MARKDOWN	markdown-link-check	7		0	1.38s
✅ MARKDOWN	markdown-table-formatter	7	2	0	0.53s
✅ REPOSITORY	checkov	yes		no	13.94s
✅ REPOSITORY	gitleaks	yes		no	8.32s
✅ REPOSITORY	git_diff	yes		no	0.1s
✅ REPOSITORY	grype	yes		no	14.5s
✅ REPOSITORY	secretlint	yes		no	2.29s
✅ REPOSITORY	trivy	yes		no	4.67s
✅ REPOSITORY	trivy-sbom	yes		no	4.5s
✅ REPOSITORY	trufflehog	yes		no	11.88s
✅ SPELL	cspell	132		0	8.97s
✅ SPELL	lychee	19		0	5.29s
✅ XML	xmllint	1	0	0	0.02s
✅ YAML	prettier	3	0	0	0.61s
✅ YAML	v8r	3		0	8.68s
✅ YAML	yamllint	3		0	0.77s

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