Improve Gremlin schema sync performance

[kmcginnes]

Description

• Improve vertex schema template query by using union
• Improved formatting for edge schema template (no query changes)
• Move the summary API request in to a function
• Add logger util, which is a thin wrapper around console.log() for now
• Add debug logging around schema fetching for Gremlin Explorer
• Fix global mock for ./utils/env

Before

g.V()
  .project("airport", "country")
  .by(V().hasLabel("airport").limit(1))
  .by(V().hasLabel("country").limit(1))
  .limit(1);

After

g.V().union(
  __.hasLabel("airport").limit(1),
  __.hasLabel("country").limit(1)
)
.fold()
.project("airport", "country")
.by(unfold().hasLabel("airport"))
.by(unfold().hasLabel("country"))

Validation

• Tested on small database
• Tested on large database (schema sync in roughly 1 second)

Related Issues

• Resolves [Task] Research suggested Gremlin query optimization #483
• Resolves [Task] Optimize the Gremlin query for schema sync #377
• Resolves [Bug] Gremlin Connector Timeout when Fetching Vertex Schema upon Database Synchronizing #225

Check List

• I confirm that my contribution is made under the terms of the Apache 2.0
  license.
• I have run pnpm checks to ensure code compiles and meets standards.
• I have run pnpm test to check if all tests are passing.
• I have covered new added functionality with unit tests if necessary.
• I have added an entry in the Changelog.md.