use weaver to generate semconv

[brettmc]

update semconv generation to use the new tooling. This is fairly close to a 1:1 of what we have now, although I noted a couple of TODOs which we might consider in future to align with what Java is doing: split attribute up into file-per-type, and split stable/unstable.

The diffs are fairly small (mostly related to formatting of comments, which weaver improves). I've removed our manually-maintained deprecations, since the semconv SIG is a lot more careful now about removing stuff - that accounts for most removals.

Fixes: #1396

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Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 73.80%. Comparing base (cd8c0e3) to head (21e5126). Report is 6 commits behind head on main.

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