Re-add query editor for Gremlin

[kmcginnes]

Description

Re-adds the query editor to the main branch.

Most of this code was originally in #878, but that was merged to aws:main-query-editor branch. Rather than have multiple PRs to review, I've combined that code (already reviewed) with the changes made in #855. Please refer to that PR for a description of those changes.

So this PR will result in:

• Gremlin query editor added to search sidebar
• Tanstack Query mutation used instead of query to prevent multiple execution of user entered queries/mutations
• Cancellation of long running queries

Validation

• Tested locally against Neptune

Related Issues

• Resolves Prevent multiple execution of mutation queries #852
• Resolves Add cancellation support to query editor #844
• Resolves Re-introduce query editor code #863

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.