Publish 1.1.0 - Githubissues

Description of the change

This is the publish PR for 1.1.0.

Added Result<T, E>, a class that represents either a Success value or a Failure with an Error.
Timestamps are now defined by the Persistable class.
Added more extensions.

A more robust Persistent HTTP Sender error handling strategy allows for better outcomes and recovery in case of server and client errors.
The Rollbar SDK will now produce more informative logs when dealing with network, HTTP client and/or server errors.
HTTP client has been modularized in order to support mocking and noop clients.
Fixed a bug where persisted payloads that couldn't be sent due to an incorrect endpoint or access token in the Config, would never be sent again when corrected.

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

[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

[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 assigned
[ ] Issue from task tracker has a link to this pull request
[ ] Changes have been reviewed by at least one other engineer