Add top level API for add_atttachment.

[antonpirker]

This PR also needs an update of the docs to make sure people use the top level API. See this docs issue: getsentry/sentry-docs#13592

[codecov]

❌ 6 Tests Failed:

Tests completed	Failed	Passed	Skipped
20401	6	20395	4417

View the top 3 failed test(s) by shortest run time

tests.integrations.redis.cluster.test_redis_cluster test_rediscluster_pipeline[False-expected_first_ten0]

Stack Traces | 0.096s run time

.../redis/cluster/test_redis_cluster.py:121: in test_rediscluster_pipeline
    pipeline = rc.pipeline()
.../redis/cluster/test_redis_cluster.py:16: in <lambda>
    redis.RedisCluster.pipeline = lambda *_, **__: pipeline_cls(None, None)
.tox/py3.12-redis-latest/lib/python3.12.../site-packages/redis/utils.py:188: in wrapper
    return func(*args, **kwargs)
.tox/py3.12-redis-latest/lib/python3.12.../site-packages/redis/cluster.py:2125: in __init__
    retries=self.cluster_error_retry_attempts,
E   AttributeError: 'ClusterPipeline' object has no attribute 'cluster_error_retry_attempts'

tests.integrations.redis.cluster.test_redis_cluster test_rediscluster_pipeline[True-expected_first_ten1]

Stack Traces | 0.097s run time

.../redis/cluster/test_redis_cluster.py:121: in test_rediscluster_pipeline
    pipeline = rc.pipeline()
.../redis/cluster/test_redis_cluster.py:16: in <lambda>
    redis.RedisCluster.pipeline = lambda *_, **__: pipeline_cls(None, None)
.tox/py3.12-redis-latest/lib/python3.12.../site-packages/redis/utils.py:188: in wrapper
    return func(*args, **kwargs)
.tox/py3.12-redis-latest/lib/python3.12.../site-packages/redis/cluster.py:2125: in __init__
    retries=self.cluster_error_retry_attempts,
E   AttributeError: 'ClusterPipeline' object has no attribute 'cluster_error_retry_attempts'

tests.integrations.redis.cluster.test_redis_cluster test_rediscluster_span_origin

Stack Traces | 0.099s run time

.../redis/cluster/test_redis_cluster.py:160: in test_rediscluster_span_origin
    pipeline = rc.pipeline(transaction=False)
.../redis/cluster/test_redis_cluster.py:16: in <lambda>
    redis.RedisCluster.pipeline = lambda *_, **__: pipeline_cls(None, None)
.tox/py3.12-redis-latest/lib/python3.12.../site-packages/redis/utils.py:188: in wrapper
    return func(*args, **kwargs)
.tox/py3.12-redis-latest/lib/python3.12.../site-packages/redis/cluster.py:2125: in __init__
    retries=self.cluster_error_retry_attempts,
E   AttributeError: 'ClusterPipeline' object has no attribute 'cluster_error_retry_attempts'

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[sentrivana]

Please also add to MIGRATION_GUIDE.md

I'll add it to the migration guide in the docs

[antonpirker]

Right! Added it to the migration guide. Its the only "new feature" right now :-)