config: add EnableGossipService option

[ohill]

Summary

This adds a configuration option EnableGossipService, true by default, for whether to serve the /v1/{genesisID}/gossip HTTP endpoint on the port configured in NetAddress. This could be useful for algod nodes that want to only serve the blocks HTTP endpoint (EnableBlockService) and/or the catchpoint file HTTP endpoint (EnableLedgerService) on the NetAddress port.

Test Plan

Added new test "TestWebsocketNetworkNoGossipService"

[codecov]

Codecov Report

Attention: 3 lines in your changes are missing coverage. Please review.

Comparison is base (90b10d2) 55.81% compared to head (31d9c9f) 55.85%.
Report is 1 commits behind head on master.

Files	Patch %	Lines
network/wsNetwork.go	40.00%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5832      +/-   ##
==========================================
+ Coverage   55.81%   55.85%   +0.03%     
==========================================
  Files         476      476              
  Lines       67138    67142       +4     
==========================================
+ Hits        37476    37503      +27     
+ Misses      27141    27119      -22     
+ Partials     2521     2520       -1     

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[cce]

LGTM!