Upgrade OTel proto version.

[etep]

Is your feature request related to a problem? Please describe. Pixie OTel export uses an older version of the Span proto. See, e.g., the following:

1. Example Pixie source code using older library_spans.

2. Diff in OTel repository showing deprecation of the same.

IIUC Pixie currently uses OTel proto v0.10.0. The latest OTel proto release is now v1.1.0.

OTel proto v0.19.0 introduced a change where library_spans were completely rm'd, see: https://github.com/open-telemetry/opentelemetry-proto/compare/v0.18.0...v0.19.0

Describe the solution you'd like Upgrade Pixie OTel proto to v1.1.0 or to either of v0.18.0 or v0.19.0. Switch to using (e.g.) scope_spans.

Describe alternatives you've considered As an alternative, we could keep using the older OTel proto version (i.e. do nothing).