feat: otel-collector snap

[yanksyoon]

Applicable spec:

Overview

• Installs opentelemetry snap on the image

Rationale

• Installs opentelemetry snap on the image (all architectures are supported)

Juju Events Changes

Module Changes

Library Changes

Checklist

• The charm style guide was applied
• The contributing guide was applied
• The changes are compliant with ISD054 - Managing Charm Complexity
• The documentation for charmhub is updated.
• The PR is tagged with appropriate label (urgent, trivial, senior-review-required, documentation)
• The docs/changelog.md is updated with user-relevant changes in the format of keep a changelog v1.1.0
• The application version is incremented in app/pyproject.toml