build: add ijson as a runtime dependency

[devin-ai-integration]

Summary

Adds ijson as a direct runtime dependency of airbyte-cdk.

ijson is a streaming JSON parser. Adding it as a CDK dep makes it available inside the source-declarative-manifest (SDM) base image so that manifest-only connectors with custom components can stream-parse very large JSON response bodies without materializing the entire document in memory.

Motivation

source-amazon-seller-partner is currently OOMing on GET_BRAND_ANALYTICS_SEARCH_TERMS_REPORT (and the other Brand Analytics reports) when reports exceed a few GB uncompressed. Its custom GzipJsonDecoder does:

1. response.content — buffers the full compressed payload.
2. gzip.decompress(...) — materializes the full decompressed bytes (~3 GB).
3. .decode("iso-8859-1") — copies that into a Python string.
4. json.loads(document) — parses the entire JSON tree.

For a ~3.2 GB report this easily peaks at 12–20 GB of memory, well past the 8 GB cap the customer is allocating. See airbytehq/oncall#12143 for the customer-facing context.

The follow-up connector PR will add a streaming GzipJsonDecoder variant in source-amazon-seller-partner/components.py that uses ijson to yield records one at a time. That PR depends on this CDK release shipping in a new SDM base image.

Why a direct dep, not optional

ijson is a small (single-digit MB) wheel with prebuilt binaries for the platforms the CDK supports. Several connectors already depend on it transitively (e.g. via unstructured/document loaders), so making it explicit is low-risk and unblocks streaming use cases for any connector that needs them.

Review & Testing Checklist for Human

• Verify ijson shows up in the new poetry.lock and that no other dependency had its resolved version changed.
• Confirm CI passes (lint, format, mypy, unit tests, dependency / package install jobs).
• Sanity-check that an SDM image rebuilt off this CDK can import ijson and use the C backend (ijson.backends.yajl2_c).

Notes

• No public CDK API changes in this PR — it is purely a dependency addition.
• A follow-up CDK PR could add a first-class streaming JSON parser to composite_raw_decoder.py (e.g., a JsonItemsParser powered by ijson) so connectors don't have to roll their own. Intentionally deferred to keep this change minimal.

Link to Devin session: https://app.devin.ai/sessions/e31a7df6ebe54ce4a68e0eecc7117555

[devin-ai-integration]

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# Run the CLI from this branch:
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[github-actions]

PyTest Results (Fast)

4 040 tests  ±0   4 028 ✅  - 1   6m 41s ⏱️ - 1m 4s
    1 suites ±0      12 💤 +1 
    1 files   ±0       0 ❌ ±0 

Results for commit d2cd1ac. ± Comparison against base commit 886fcf8.

This pull request skips 1 test.

unit_tests.sources.declarative.test_concurrent_declarative_source ‑ test_read_with_concurrent_and_synchronous_streams

[github-actions]

PyTest Results (Full)

4 043 tests  ±0   4 031 ✅ ±0   11m 42s ⏱️ +19s
    1 suites ±0      12 💤 ±0 
    1 files   ±0       0 ❌ ±0 

Results for commit d2cd1ac. ± Comparison against base commit 886fcf8.