feat: add Laravel runtime version reporting

[tomlongridge]

Uses new hook in Configuration to append the Laravel/Lumen application version to device data to
make it reportable.

Goal

Augments reporting with the version of Laravel or Lumen in use when an event occurred in case of issues in a specific version of the framework.

Design

Added data to device.runtimeVersions.laravel and .lumen as per other notifiers.

Changeset

Added

• BugsnagServiceProvider.addRuntimeVersion - new function that determines the version and key name to use

Changed

• BugsnagServiceProvider.register - appends the runtime version information to the device data through the Bugsnag client

Tests

• No unit tests present for this level of testing - checked the data was present after running the example laravel and lumin projects (requires the feature branch of bugsnag-php)

Review

For the submitter, initial self-review:

• Commented on code changes inline explain the reasoning behind the approach
• Reviewed the test cases added for completeness and possible points for discussion
• A changelog entry was added for the goal of this pull request
• Check the scope of the changeset - is everything in the diff required for the pull request?
• This pull request is ready for:
  • Initial review of the intended approach, not yet feature complete
  • Structural review of the classes, functions, and properties modified
  • Final review

For the pull request reviewer(s), this changeset has been reviewed for:

• Consistency across platforms for structures or concepts added or modified
• Consistency between the changeset and the goal stated above
• Internal consistency with the rest of the library - is there any overlap between existing interfaces and any which have been added?
• Usage friction - is the proposed change in usage cumbersome or complicated?
• Performance and complexity - are there any cases of unexpected O(n^3) when iterating, recursing, flat mapping, etc?
• Concurrency concerns - if components are accessed asynchronously, what issues will arise
• Thoroughness of added tests and any missing edge cases
• Idiomatic use of the language

[mikeewhite]

LGTM