* Add PostgreSQL test containers to integration tests
* Introduced `setupPostgreSQLTestContainer` to initialize and start a PostgreSQL test container using Testcontainers.
* Updated existing tests in `api`, `cmd`, and `network` packages to use the test containers for PostgreSQL.
* Removed hardcoded PostgreSQL addresses and replaced them with dynamic test container addresses.
* Refactored the test setup to ensure consistent test environments across multiple test files.
* Moved server log test after clients testes
* Create testhelper package and add SetupPostgreSQLTestContainer for reuse in other packages

* Update SDK
* Update deps
* Disable gomoddirectives linter

* Fix bug in COPY command by differentiating between total reads vs. chunk reads
* Fix bug in concurrent reads and writes
* Remove explicit condition for checking total being zero
* Return early if there is no data from the server (to send to the client)