Add add_attachment() top level API

[antonpirker]

Users should not need to get the Scope and add the attachment there, we can do it for them. This has been first implemented in SDK 3.0 and is now back ported to 2.x.

[codecov]

❌ 6 Tests Failed:

Tests completed	Failed	Passed	Skipped
23568	6	23562	5866

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 | 0.086s 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 | 0.087s 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 | 0.087s run time

.../redis/cluster/test_redis_cluster.py:162: 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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