feat(helm): add logFormat and logLevel params, update app version

[burningalchemist]

This pull request includes several updates to the Helm chart for the sql-exporter application, focusing on version upgrades and configuration enhancements. The most important changes include version updates in the Chart.yaml and README.md files, the addition of new configuration options for logging, and corresponding updates to the deployment template and values file.

Version Updates:

• helm/Chart.yaml: Update the version to 0.9.0 and appVersion to 0.16.0.
• helm/README.md: Update the badges to reflect the new version and appVersion.

Configuration Enhancements:

• helm/README.md: Add descriptions for createConfig, logLevel, and logFormat options.
• helm/templates/deployment.yaml: Add arguments for log.level and log.format with default values.
• helm/values.yaml: Add logLevel and logFormat options with default values and updated the comment for createConfig.