Semconv entrypoints

[dyladan]

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This is a draft PR to explore using entrypoints for explicit version imports of semconv

Changes:

1. Duplicate existing files to 1.7 dir
2. Add deprecation notes to index export entries explaining that you should import a version directly

Future changes:

• Add a 1.25 dir/entrypoint
• Add a 1.26 dir/entrypoint
• and so on

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Importing from the default import is deprecated

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Importing 1.7 entrypoint is unchanged from previous