Implement Lisk Service as a plugin

[ManuGowda]

Description

Implement Lisk Service as Lisk Framework plugin

Motivation

• Using HTTP API framework plugin will limit the information and performance of the lisk-service
• Creating as a plugin will have all information required to persist in a way that lisk-service can perform better
• No dependency on the framework plugin, and user can install lisk-service as other plugins

Additional Information

Originally raised by @shuse2

• Another approach is to have database adaptor as framework plugin, and lisk-service rely on the database adaptor plugin. However, this has disadvantate because if we implement database adaptor as framework plugin, data has to be generic. Which means some of the search capability could be limited by the generic data structure