[Refactoring] RouterService wrapRoutes -> filter

[codecov[bot]]

Codecov Report

Patch coverage: 100.00% and project coverage change: -0.06% :warning:

Comparison is base (a98c39c) 93.05% compared to head (6b153b6) 92.99%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #61 +/- ## ============================================ - Coverage 93.05% 92.99% -0.06% + Complexity 1936 1933 -3 ============================================ Files 128 128 Lines 4331 4325 -6 Branches 605 604 -1 ============================================ - Hits 4030 4022 -8 - Misses 165 166 +1 - Partials 136 137 +1 ``` | [Files Changed](https://app.codecov.io/gh/open-coap/java-coap/pull/61?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=open-coap) | Coverage Δ | | |---|---|---| | [.../main/java/com/mbed/coap/server/RouterService.java](https://app.codecov.io/gh/open-coap/java-coap/pull/61?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=open-coap#diff-Y29hcC1jb3JlL3NyYy9tYWluL2phdmEvY29tL21iZWQvY29hcC9zZXJ2ZXIvUm91dGVyU2VydmljZS5qYXZh) | `100.00% <100.00%> (ø)` | | | [...ap/metrics/micrometer/MicrometerMetricsFilter.java](https://app.codecov.io/gh/open-coap/java-coap/pull/61?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=open-coap#diff-Y29hcC1tZXRyaWNzL3NyYy9tYWluL2phdmEvb3JnL29wZW5jb2FwL2NvYXAvbWV0cmljcy9taWNyb21ldGVyL01pY3JvbWV0ZXJNZXRyaWNzRmlsdGVyLmphdmE=) | `95.23% <100.00%> (ø)` | | ... and [1 file with indirect coverage changes](https://app.codecov.io/gh/open-coap/java-coap/pull/61/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=open-coap)

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