Add rollbar-android option to detect when the network is unavailable …

[diegov]

Description of the change

Add rollbar-android option to detect when the network is unavailable and suspend sending occurrences.

The ConnectivityDetector depends on OS features so it has been tested manually, on-device and on emulators from API 16 up to 30.

Maintaining backwards compatibility was factored heavily into the choice of implementation.

Changes that were avoided in order to maintain compatibility:

• Changing Sender.send to return a value or future representing the outcome of sending the payload. We are using the existing sender listeners instead
• Modifying the queue item type to leave the bookkeeping variable sendAttemptCount out of the payload class (the sender queue is user configurable so some SDK users might be using their own queue implementation)
• Adding "transactional-like" queue semantics to rollback the poll action instead of reenqueing when a payload must be retried (same reason as above)

Type of change

• [ ] Bug fix (non-breaking change that fixes an issue)
• [x] New feature (non-breaking change that adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)

Related issues

• [ch91148]

Checklists

Development

• [x] Lint rules pass locally
• [x] The code changed/added as part of this pull request has been covered with tests
• [x] All tests related to the changed code pass in development

Code review

• [x] This pull request has a descriptive title and information useful to a reviewer. There may be a screenshot or screencast attached
• [x] "Ready for review" label attached to the PR and reviewers mentioned in a comment
• [x] Changes have been reviewed by at least one other engineer
• [x] Issue from task tracker has a link to this pull request

[shortcut-integration[bot]]

This pull request has been linked to Shortcut Story #91148: rollbar-android: if network is not available occurrences should be saved and re-sent later.