Release opentelemetry-proto v1.11.0 (Profiling Alpha)

[felixge]

See #64

[felixge]

Note: Technically v1.11.0 is the first proto release in which the profiling signal is marked as alpha maturity. However, there are no difference between this version and v1.10.0 - so the v1.54.0/v0.148.0 collector release can be considered the first version of the collector that effectively contains the profiling alpha.