Fix gremlin-python GremlinLang equality and submitAsync bugs

[GumpacG]

gremlin-python bug fixes

Two bugs introduced in 4.0.0-beta.1 during the Bytecode-to-GremlinLang
migration.

1. GremlinLang.__eq__ ignores the query

File: gremlin_python/process/traversal.py

__eq__ compared self.gremlin to itself instead of to other.gremlin, so
equality depended only on the parameters and ignored the actual steps.

Problem use case

a = g.V().count().gremlin_lang
b = g.V().drop().gremlin_lang
a == b

Behaviour

	Result
Before	True - two completely different queries (with equal/empty parameters) compare equal
After	False - equality now considers the query steps as well as the parameters

2. DriverRemoteConnection.submitAsync is broken (removed)

File: gremlin_python/driver/driver_remote_connection.py

The deprecated submitAsync alias forwarded three positional arguments to
submit_async, which had been narrowed to a single gremlin_lang argument in
4.x, and it never returned the future - so it could not work at all. Rather than
repair a deprecated method, it has been removed (per PR review), with an upgrade
note directing users to submit_async().

Problem use case

conn = DriverRemoteConnection('http://localhost:8182/gremlin', 'g')
future = conn.submitAsync(gremlin_lang)
result = future.result()

Behaviour

	Result
Before	Raises TypeError: submit_async() takes 2 positional arguments but 4 were given; even setting that aside it returned None instead of a future
After	submitAsync is removed; use submit_async(gremlin_lang), which returns the Future (resolving to a RemoteTraversal)

Tests

• tests/unit/process/test_gremlin_lang.py: equality of traversals with
  different steps / equal params, equal objects, differing params, and
  non-GremlinLang comparison.
• tests/unit/driver/test_remote_connection.py: submitAsync emits the
  deprecation warning, forwards a single argument, returns a Future resolving
  to a RemoteTraversal, and no longer raises TypeError.

Assisted-by: Kiro: Claude Opus 4.8

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 76.41%. Comparing base (a28cd1f) to head (c26d4c4).
⚠️ Report is 277 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #3520      +/-   ##
============================================
+ Coverage     76.35%   76.41%   +0.05%     
- Complexity    13424    14269     +845     
============================================
  Files          1012     1036      +24     
  Lines         60341    64527    +4186     
  Branches       7075     7650     +575     
============================================
+ Hits          46076    49306    +3230     
- Misses        11548    12129     +581     
- Partials       2717     3092     +375     

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[xiazcy]

VOTE +1

[Cole-Greer]

Building on my comment above, I'd like to either remove submitAsync() now, or open a JIRA to track it. I'm happy with either of those directions for this PR.

VOTE +1