fix(encoding): fix encoding errors when the span started a very long time ago

[wantsui]

Possible cause behind #12240. If the span started a very long time ago, the encoding fails with:

raise RuntimeError("failed to pack span: {!r}. Exception: {}".format(span, e))
E RuntimeError: failed to pack span: <Span(id=2850960614187153438,trace_id=137823137092894037702114325005943826011,parent_id=None,name=None)>. Exception: Python int too large to convert to C long

TODO: Find a good way to check the min/max without causing issues.

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• The change includes tests OR the PR description describes a testing strategy
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• Reviewer has checked that all the criteria below are met
• Title is accurate
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[github-actions]

CODEOWNERS have been resolved as:

tests/tracer/test_encoders.py                                           @DataDog/apm-sdk-api-python

[datadog-dd-trace-py-rkomorn]

Datadog Report

Branch report: wantsui/span-start-time
Commit report: 0b22c45
Test service: dd-trace-py

✅ 0 Failed, 130 Passed, 1184 Skipped, 1m 36.47s Total Time

[pr-commenter]

Benchmarks

Benchmark execution time: 2025-02-14 23:44:35

Comparing candidate commit 0b22c45 in PR branch wantsui/span-start-time with baseline commit a5e3552 in branch main.

Found 0 performance improvements and 0 performance regressions! Performance is the same for 418 metrics, 2 unstable metrics.