TINKERPOP-3233 Go support for escaped characters

[GumpacG]

https://issues.apache.org/jira/browse/TINKERPOP-3233
This is the first part of resolving the ticket.

This change fixes a bug in Go in which characters that should be escaped are being replaced by a dot.
Bug:
The traversal result, err := g.V().Has(vertexLabel, "name", "m m").Next() would generate the GremlinLang g.V().has(vertexLabel, "name", "m.m").next().
New behaviour:
The traversal result, err := g.V().Has(vertexLabel, "name", "m m").Next() would generate the GremlinLang g.V().has(vertexLabel, "name", "m\tm").next().

A test has been added to gremlinlang_test.go for testing all cases that should be escaped.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 76.25%. Comparing base (cfd6889) to head (416de79).
⚠️ Report is 990 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #3381      +/-   ##
============================================
- Coverage     77.87%   76.25%   -1.63%     
+ Complexity    13578    13313     -265     
============================================
  Files          1015     1011       -4     
  Lines         59308    59832     +524     
  Branches       6835     7004     +169     
============================================
- Hits          46184    45622     -562     
- Misses        10817    11527     +710     
- Partials       2307     2683     +376     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.

[Cole-Greer]

Nit: Throw a single quote in there too

Suggested change

	return g.V().Has("name", "\"marko\n\r\t\b\f\"")
	},
	equals: "g.V().has(\"name\",\"\\\"marko\\n\\r\\t\\b\\f\\\"\")",
	return g.V().Has("name", "\"marko\n\r\t\b\f\'")
	},
	equals: "g.V().has(\"name\",\"\\\"marko\\n\\r\\t\\b\\f\\\'\")",

[Cole-Greer]

Thanks @GumpacG, LGTM. VOTE +1