Check if required plugins are enabled in history APIs

[abitmore]

User Story
As an API user I want to see clearer error messages when calling APIs from nodes that didn't enable required plugins:

• get_fill_order_history
• get_market_history
  * other related APIs?

Impacts
Describe which portion(s) of BitShares Core may be impacted by your request. Please tick at least one box.

• API (the application programming interface)
• Build (the build process or something prior to compiled code)
• CLI (the command line wallet)
• Deployment (the deployment process after building such as Docker, Travis, etc.)
• DEX (the Decentralized EXchange, market engine, etc.)
• P2P (the peer-to-peer network for transaction/block propagation)
• Performance (system or user efficiency, etc.)
• Protocol (the blockchain logic, consensus, validation, etc.)
• Security (the security of system or user data, etc.)
• UX (the User Experience)
• Other (please add below)

Additional Context (optional)
Add any other context about your request here.

CORE TEAM TASK LIST

• Evaluate / Prioritize Feature Request
• Refine User Stories / Requirements
• Define Test Cases
• Design / Develop Solution
• Perform QA/Testing
• Update Documentation

[jmjatlanta]

Related #1070

[abitmore]

This ticket was just for adding a FC_ASSERT at the entrance of the API calls to avoid seeing error messages like this:

unlocked >>> get_market_history BTS USD 3600 "2019-09-01T00:00:00" "2019-10-02T00:00:00"
0 exception: unspecified
Execution error
{"error":"Execution error","data":{"id":13,"error":{"code":10,"message":"Execution error","data":{"code":10,"name":"assert_exception","message":"Assert Exception","stack":[{"context":{"level":"error","file":"object_database.cpp","line":57,"method":"get_index","hostname":"","thread_name":"th_a","timestamp":"2019-10-07T07:18:58"},"format":"_index[space_id].size() > type_id: ","data":{"space_id":5,"type_id":1,"index[space_id].size":0}},{"context":{"level":"warn","file":"api.cpp","line":502,"method":"get_market_history","hostname":"","thread_name":"th_a","timestamp":"2019-10-07T07:18:58"},"format":"","data":{"asset_a":"BTS","asset_b":"USD","bucket_seconds":3600,"start":"2019-09-01T00:00:00","end":"2019-10-02T00:00:00"}}]}}}}
th_a state.cpp:39 handle_reply

Ideally I'd refactor the API classes, adopt the _has_market_history_plugin approach done in database_api to improve performance a bit, however it's not a priority for me right now.

#1070 is more generic.

[abitmore]

Fixed by #2158.