Added diff method, yang-models support and expanded _clab.

[azyablov]

• clab pumped to v23.3.1, added ixr6 spine3&4 to allow OC testing
• improved error handling and wrapping for JRPC client and messages
• added method diff
• updated curl mock JSON payload files
• udated params for intergration tests
• exluded local testdata
• added yang-models support
• added diff method tests
• added diff method support, new Request message constructors, yang-models support and expanded test scope to include new logic
• added yang-models support
• datastore unti tests improvements
• added suuport for yang-models and diff method, improved errors with apierr, new methods: DiffCandidate, BulkSetCandidate, BulkDiffCandidate + instroduced new message builders
• added suuport for yang-models and diff method, inlcuded missed Tools() integration tests, itroduced improved error handling and expanded tests with OC cases
• updated srl version
• updated clab version
• udpated exec for clients
• commented spine1&2 to reduce lab footprint
• tshooting ci pipeline
• clean-up comments with privious error style
• adding spine3&4 back
• udpated clab and integration test params in respect ot that