chore: Eslint v9

[teogeb]

Changes

Converted the configuration file to flat config and unified to config file style. Otherwise same rules are earlier, except:

• some new rules are now inherited from the updated eslint-config-streamr-ts
  • removed locally defined rules if exactly same as inherited
• converted cli-tools logging statements to use console.info instead of console.log and removed the no-console rule from that package

Fixed lint errors and removed obsolete eslint-disable directives. Also fixed a type in Operator.test.ts.

Added eslint-import-resolver-typescript dependency. It is needed by eslint-plugin-import (see https://github.com/import-js/eslint-plugin-import?tab=readme-ov-file#typescript).

Other PRs

Temporarily disabled linting of browser classes in commit 876423f. That is needed until we merge #2848 to main. We should revert the commit either in this PR or in that PR (whichever is landed to main later).