Kinesis: honour NextToken/MaxResults in list_stream_consumers

[UTKARSH698]

Problem

ListStreamConsumers declares NextToken and MaxResults as input members and NextToken as an output member:

ListStreamConsumers IN : ['StreamARN', 'NextToken', 'MaxResults', 'StreamCreationTimestamp']
                   OUT: ['Consumers', 'NextToken']

moto read neither input parameter and never emitted NextToken -- list_stream_consumers returned every consumer in a single response and carried a Pagination is not yet implemented docstring. Clients that page explicitly either loop forever on an unchanging token or silently receive the full list when they asked for a bounded page.

Fix

Wires the operation through the module's existing @paginate(PAGINATION_MODEL) helper, exactly as list_shards already does in the same files:

• moto/kinesis/utils.py -- new PAGINATION_MODEL entry, unique_attribute is consumer_arn (already unique per consumer)
• moto/kinesis/models.py -- @paginate decorator, and the now-inaccurate docstring removed
• moto/kinesis/responses.py -- reads NextToken/MaxResults and returns the token

limit_default is 10000, matching both list_shards and the botocore MaxResults max, so a caller that passes no MaxResults gets the same full list as before -- no behaviour change for existing users.

Verification

Against a real boto3 client, 5 consumers at MaxResults=2:

page1: ['c0', 'c1'] | NextToken present
page2: ['c2', 'c3'] | NextToken present
page3: ['c4']       | NextToken absent
no-args (back-compat): ['c0','c1','c2','c3','c4']
botocore paginator:    ['c0','c1','c2','c3','c4']

The last page correctly omits NextToken (moto emits null and botocore drops JSON nulls), so botocore's own paginator terminates.

Test added to the existing tests/test_kinesis/test_kinesis_stream_consumers.py, including the no-MaxResults back-compat assertion. tests/test_kinesis/: 81 passed; the 4 failures are pre-existing openapi_spec_validator import errors in test_kinesis_cloudformation.py, unrelated to this change. ruff check, ruff format --check and mypy moto/kinesis/ all clean. The docs/ stanza is updated to match the removed docstring.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.24%. Comparing base (9fcefb7) to head (e1f206c).

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #10161      +/-   ##
==========================================
- Coverage   93.24%   93.24%   -0.01%     
==========================================
  Files        1326     1326              
  Lines      121003   121006       +3     
==========================================
  Hits       112832   112832              
- Misses       8171     8174       +3     

Flag	Coverage Δ
servertests	27.96% <20.00%> (+<0.01%)	⬆️
unittests	93.22% <100.00%> (-0.01%)	⬇️

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