[Python-based kubelet] Parse resources with exponent notation

[tbavelier]

What does this PR do?

• Changes the parse_quantity function to cover resources from pods set with exponent notation https://kubernetes.io/docs/concepts/configuration/manage-resources-containers/#meaning-of-memory :

Limits and requests for memory are measured in bytes. You can express memory as a plain integer or as a fixed-point number using one of these quantity suffixes: E, P, T, G, M, k. You can also use the power-of-two equivalents: Ei, Pi, Ti, Gi, Mi, Ki. For example, the following represent roughly the same value:
128974848, 129e6, 129M, 128974848000m, 123Mi

Motivation

• Customer case where the current parsing provides exabytes value for kubernetes.memory.requests due to the current parsing function : CONS-6245

Additional Notes

• The kubelet check is moving to a Go-based check : the Agent (Go) implementation does not suffer from this issue as it directly uses the k8s quantity.go to benefit from AsApproximateFloat64 for the parsing : https://github.com/DataDog/datadog-agent/blob/main/pkg/collector/corechecks/containers/kubelet/provider/pod/provider.go#L135-L139
• It can be QA'd with the following manifest :

apiVersion: v1
kind: Pod
metadata:
  name: exponent-pod
spec:
  containers:
    - name: redis
      image: redis:latest
      ports:
        - containerPort: 6379
      resources:
        requests:
          memory: "1.181116006E9"
          cpu: "250m"
        limits:
          memory: "1.181116006E9"
          cpu: "500m"
    - name: nginx
      image: nginx:latest
      resources:
        requests:
          memory: "1.181116006e9"
          cpu: "250m"
        limits:
          memory: "1.181116006e9"
          cpu: "500m"

Both memory.limits and memory.requests should be 1.1 GiB

Review checklist (to be filled by reviewers)

• Feature or bugfix MUST have appropriate tests (unit, integration, e2e)
• Changelog entries must be created for modifications to shipped code
• Add the qa/skip-qa label if the PR doesn't need to be tested during QA.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.48%. Comparing base (3bd07bb) to head (646c3e0).
Report is 5 commits behind head on master.

Additional details and impacted files

Flag	Coverage Δ
activemq	?
cassandra	?
confluent_platform	?
hive	?
hivemq	?
hudi	?
ignite	?
jboss_wildfly	?
kafka	?
kubelet	91.01% <100.00%> (+0.01%)	⬆️
presto	?
solr	?
weblogic	?

Flags with carried forward coverage won't be shown. Click here to find out more.

[github-actions]

Test Results

  2 files    2 suites   6s ⏱️
 72 tests  72 ✅ 0 💤 0 ❌
144 runs  144 ✅ 0 💤 0 ❌

Results for commit 646c3e0.