ref(boto3): Split integration into internal modules

[pabloDeputter]

Description

Move Boto3Integration from single module into package with smaller internal modules.

• botocore client patching is moved into _client.py.
• request instrumentation and event handlers into _instrumentation.py.
• existing public import is kept unchanged: from sentry_sdk.integrations.boto3 import Boto3Integration.

[github-actions]

Codecov Results 📊

✅ 128339 passed | ⏭️ 7148 skipped | Total: 135487 | Pass Rate: 94.72% | Execution Time: 405m 30s

📊 Comparison with Base Branch

Metric	Change
Total Tests	📈 +30
Passed Tests	📈 +13
Failed Tests	—
Skipped Tests	📈 +17

All tests are passing successfully.

✅ Patch coverage is 94.12%. Project has 2534 uncovered lines.
✅ Project coverage is 90.17%. Comparing base (494ecb3) to head (68c2877).

Files with missing lines (1)

File	Patch %	Lines
sentry_sdk/integrations/boto3/_client.py	91.67%	⚠️ 2 Missing

Coverage diff

@@            Coverage Diff             @@
##        master       #PR       +/-##
==========================================
+ Coverage    90.17%    90.17%        —%
==========================================
  Files          193       195        +2
  Lines        25773     25786       +13
  Branches      9532      9532         —
==========================================
+ Hits         23241     23252       +11
- Misses        2532      2534        +2
- Partials      1431      1431         —

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[ericapisani]

@pabloDeputter and I chatted a bit about this offline, leaving notes here for other reviewers and so we don't forget about this when we come back to this on Monday:

We're going to look to reorganize things a little bit in order to remove this dynamic import and the one on line 24 in the _client.py file below .

The import cycle can be mitigated by moving the values for identifier and origin that currently live on the Boto3Integration to a consts.py file, and having the _instrumentation.py file import those values from there.

We can also look to pull up the minimum version check from within _client.py to here.

So this file would look like the following after these changes:

from sentry_sdk.integrations import DidNotEnable, Integration, _check_minimum_version
from sentry_sdk.integrations.boto3._client import _patch_botocore_client
from sentry_sdk.integrations.boto3.consts import IDENTIFIER, ORIGIN
from sentry_sdk.utils import parse_version

try:
    from botocore import __version__ as BOTOCORE_VERSION
except ImportError:
    raise DidNotEnable("botocore is not installed")


class Boto3Integration(Integration):
    identifier = IDENTIFIER
    origin = ORIGIN

    @staticmethod
    def setup_once() -> None:
        version = parse_version(BOTOCORE_VERSION)
        _check_minimum_version(Boto3Integration, version, "botocore")

        _patch_botocore_client()