feat(#74): allow passing Path Parameters as handler parameters - closes #74

[francescovallone]

Description

Allow passing path parameters as handler parameters. From this point forward both the previous version and this are accepted by Serinus. This means both these handlers are accepted by the framework.

    on(
      TestRoute(path: '/path/<value>'),
      (context) async {
        return context.params['value'];
      },
    );
    on(
      TestRoute(path: '/path/<value>'),
      (RequestContext context, String value) async {
        return value;
      },
    );

Fixes #74

Type of change

Please delete options that are not relevant.

• [x] New feature (non-breaking change which adds functionality)
• [x] This change requires a documentation update

Checklist:

• [x] My code follows the style guidelines of this project
• [x] I have performed a self-review of my code
• [x] I have commented my code, particularly in hard-to-understand areas
• [x] I have made corresponding changes to the documentation
• [x] My changes generate no new warnings
• [x] I have added tests that prove my fix is effective or that my feature works
• [x] New and existing unit tests pass locally with my changes
• [x] Any dependent changes have been merged and published in downstream modules

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 89.83%. Comparing base (cfbbf65) to head (b1ab755). Report is 11 commits behind head on develop.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #88 +/- ## =========================================== + Coverage 89.75% 89.83% +0.08% =========================================== Files 73 73 Lines 2605 2626 +21 =========================================== + Hits 2338 2359 +21 Misses 267 267 ```

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