WIP: Prepare to v3.0.0 — drop Node <24, remove Yarn/Lerna, modernize tooling

[OleksiiZubko]

Migrate the monorepo tooling for the 3.0.0 release:

- Replace Lerna + Yarn workspaces with npm workspaces (topological build);
- Require Node.js >= 24 (engines) and build/test on Node 24 in CI.
- Replace deprecated TSLint with ESLint (typescript-eslint + prettier config).
- Migrate the test suites from Mocha/Chai/Sinon to Vitest. Convert per-package and cross-package (integration/functional/api-breaks) runners;
- De-barrel package-internal self imports to relative leaf paths so Vitest can mock them. Keep public API (index exports) unchanged.
- Upgrade build tooling: TypeScript 5, webpack 5 (drop terser-webpack-plugin), Prettier 3, Husky 9, lint-staged 15. Hoist shared dev dependencies to root.
- Remove the deprecated `codecov` npm package (upload stays in the GitHub Action) and replace `serve` with a zero-dependency static file server.
- Update CI/publish scripts, examples and documentation to Node 24 and npm.

Relates-To: MAJOR

[codecov]

Codecov Report

❌ Patch coverage is 86.46617% with 36 lines in your changes missing coverage. Please review.
✅ Project coverage is 43.5596%. Comparing base (36a57e3) to head (fde07f0).

Files with missing lines	Patch %	Lines
...olp-sdk-dataservice-read/lib/client/QueryClient.ts	60.6061%	13 Missing ⚠️
...here/olp-sdk-dataservice-read/lib/utils/getTile.ts	62.5000%	6 Missing ⚠️
...k-dataservice-read/lib/client/StreamLayerClient.ts	90.0000%	5 Missing ⚠️
...p-sdk-dataservice-read/lib/client/CatalogClient.ts	88.5715%	4 Missing ⚠️
...re/olp-sdk-core/lib/utils/RequestBuilderFactory.ts	83.3334%	3 Missing ⚠️
...dataservice-read/lib/client/VolatileLayerClient.ts	91.4286%	3 Missing ⚠️
...k-dataservice-read/lib/client/PartitionsRequest.ts	50.0000%	1 Missing ⚠️
...dk-dataservice-read/lib/client/StatisticsClient.ts	90.9091%	1 Missing ⚠️

Additional details and impacted files

@@                Coverage Diff                @@
##             master       #541         +/-   ##
=================================================
- Coverage   90.1118%   43.5596%   -46.5522%     
=================================================
  Files            82         85          +3     
  Lines          2953       6956       +4003     
  Branches        333        324          -9     
=================================================
+ Hits           2661       3030        +369     
- Misses          136       3926       +3790     
+ Partials        156          0        -156     

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