Update R-cran-* WWW to modern URL

Old R-cran-* ports have https://cran.r-project.org/web/packages/${PORTNAME}

New R-cran-* ports have https://cran.r-project.org/package=${PORTNAME}

Replace all the old WWW URLs with new WWW URLs

Reviewed by:	fuz
Differential Revision:	https://reviews.freebsd.org/D59714

devel/R-cran-otel: Add new port

High-quality, ubiquitous, and portable telemetry to enable effective
observability. OpenTelemetry is a collection of tools, APIs, and
SDKs used to instrument, generate, collect, and export telemetry
data (metrics, logs, and traces) for analysis in order to understand
your software's performance and behavior. This package implements
the OpenTelemetry API: <https://opentelemetry.io/docs/specs/otel/>.
Use this package as a dependency if you want to instrument your R
package for OpenTelemetry.