Create network sync and background fetch services for each node

[risavkarna]

The network sync should rely only on CouchDB for database level network communications and zeromq and/or redis for all other intra-system communications.

[risavkarna]

This library will also expose a @cache annotation that works like a standard cache annotation on TS. This will be based on Spring's @Cacheable(value: string, key= string) annotation. @CacheEvict equivalent and similar other features will be added later.