Make storage library static

[LaurentiuCristofor]

The storage library had remained declared as SHARED instead of STATIC, which leads to failures because it's not picked up by the gaia package.

[simone-gaia]

LGTM, it would be ideal to have a test in test_sdk to ensure this won't happen again.

[LaurentiuCristofor]

LGTM, it would be ideal to have a test in test_sdk to ensure this won't happen again.

I'm not sure how we can test for this. test_sdk runs within our general build framework, so that's why it continued to work. The problem is that we'd need to install the sdk and then test it in that context, but we don't have such a test as part of the local build - only as part of the TeamCity build, which is how this issue surfaced.

Also, this is a leftover from the time when all our libraries were SHARED. When we first built the SDK, we updated them to STATIC but this library was left unchanged because it wasn't used by the system yet. This kind of issue is unlikely to happen in the future and if it does, it will get caught by the TeamCity testing, which I think is good enough.