Add test template for layer

[zhoonit]

1. Layer semantics test (testing if given layer object obeys semantics, such as we shouldn't validate, valid properties should be valid and so on)
2. Layer properties test (90% gonna be merged to layer semantics)
3. Layer golden test (with a python script using recorder to generate one single file) #1558

There will be a test template using TEST_P and testing each object will be much simpler than few thousand lines of code.

starting from #1303, planned to be done within layer v2 migration but delayed after layer v2 migration as per request

[taos-ci]

:octocat: cibot: Thank you for posting issue #1318. The person in charge will reply soon.