implementation of server synchronization

config/environment.default.js

src/app/core/cache/object-cache.actions.ts

src/app/core/cache/object-cache.reducer.ts

src/app/core/cache/object-cache.service.ts

src/app/core/cache/response-cache.service.ts

src/app/core/cache/server-sync-buffer.actions.ts

src/app/core/cache/server-sync-buffer.effects.ts

src/app/core/cache/server-sync-buffer.reducer.ts

src/app/core/core.reducers.ts

src/config/auto-sync-config.interface.ts

src/config/cache-config.interface.ts