fix: inconsistent dll linkage (Windows/VS)

Type of change

• Bug Fix
• Feature
• Pipeline
• Test

Does this introduce a change in the core logic?

• No
• Yes

Does this introduce a change in the cloud provider implementation, if so which cloud?

• AWS
• Azure
• GCP
• IBM

Does this follow conventional commits spec?

• No
• Yes

Have you set the target Milestone?

• No
• Yes

Have you set the no-detached-pipeline label?

• No
• Yes

Updates description?

This MR fixes build warnings and linking errors on Windows platform when unit tests are enabled (where uses static library).

• Move definition BUILDING_DLL from source files to CMake
• Disable export DLL interfaces for static library version
• Fix warning "Command line warning D9025: overriding '/W3' with '/W4'" (reproducible in the CMake single configuration)

Part of issue: #18