NXPY-199: Add support for idempotent calls

[BoboTiG]

Introduced:

• OngoingRequestError and Conflict exceptions.
• IDEMPOTENCY_KEY constant.

[nuxeojenkins]

View issue in JIRA: NXPY-199: Introduce OngoingRequestError and Conflict exceptions

[sourcery-ai]

Sourcery Code Quality Report

❌  Merging this PR will decrease code quality in the affected files by 0.62%.

Quality metrics	Before	After	Change
Complexity	2.29 ⭐	2.39 ⭐	0.10 👎
Method Length	54.60 ⭐	55.05 ⭐	0.45 👎
Working memory	8.92 🙂	8.94 🙂	0.02 👎
Quality	70.52% 🙂	69.90% 🙂	-0.62% 👎

Other metrics	Before	After	Change
Lines	1234	1367	133

Changed files	Quality Before	Quality After	Quality Change
nuxeo/client.py	62.60% 🙂	62.95% 🙂	0.35% 👍
nuxeo/constants.py	79.63% ⭐	79.20% ⭐	-0.43% 👎
nuxeo/exceptions.py	91.73% ⭐	92.32% ⭐	0.59% 👍
tests/test_batchupload.py	68.23% 🙂	66.24% 🙂	-1.99% 👎
tests/test_exception.py	95.21% ⭐	95.84% ⭐	0.63% 👍

Here are some functions in these files that still need a tune-up:

File	Function	Complexity	Length	Working Memory	Quality	Recommendation
nuxeo/client.py	NuxeoClient.request	13 🙂	255 ⛔	17 ⛔	32.66% 😞	Try splitting into smaller methods. Extract out complex expressions
tests/test_batchupload.py	test_upload_several_callbacks	5 ⭐	262 ⛔	13 😞	44.53% 😞	Try splitting into smaller methods. Extract out complex expressions
tests/test_batchupload.py	test_idempotent_requests	5 ⭐	266 ⛔	12 😞	45.92% 😞	Try splitting into smaller methods. Extract out complex expressions
nuxeo/client.py	NuxeoClient._log_response	10 🙂	125 😞	15 😞	48.18% 😞	Try splitting into smaller methods. Extract out complex expressions
tests/test_batchupload.py	test_upload	4 ⭐	238 ⛔	11 😞	50.04% 🙂	Try splitting into smaller methods. Extract out complex expressions

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[BoboTiG]

Tests are failing because the server does not contain the work done on NXP-30081.