Add serde derive macros where applicable

[codecov[bot]]

Codecov Report

Patch coverage has no change and project coverage change: +0.28 :tada:

Comparison is base (4b6e0b6) 99.29% compared to head (ace6da1) 99.58%.

:exclamation: Current head ace6da1 differs from pull request most recent head 96eb8d7. Consider uploading reports for the commit 96eb8d7 to get more accurate results

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #45 +/- ## ========================================== + Coverage 99.29% 99.58% +0.28% ========================================== Files 142 51 -91 Lines 35230 21910 -13320 ========================================== - Hits 34980 21818 -13162 + Misses 250 92 -158 ``` | [Impacted Files](https://app.codecov.io/gh/JulianSchmid/etherparse/pull/45?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Julian+Schmid) | Coverage Δ | | |---|---|---| | [src/internet/ip.rs](https://app.codecov.io/gh/JulianSchmid/etherparse/pull/45?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Julian+Schmid#diff-c3JjL2ludGVybmV0L2lwLnJz) | `100.00% <ø> (ø)` | | | [src/internet/ip\_authentication.rs](https://app.codecov.io/gh/JulianSchmid/etherparse/pull/45?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Julian+Schmid#diff-c3JjL2ludGVybmV0L2lwX2F1dGhlbnRpY2F0aW9uLnJz) | `98.52% <0.00%> (ø)` | | | [src/internet/ipv4.rs](https://app.codecov.io/gh/JulianSchmid/etherparse/pull/45?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Julian+Schmid#diff-c3JjL2ludGVybmV0L2lwdjQucnM=) | `99.40% <0.00%> (ø)` | | | [src/internet/ipv4\_extensions.rs](https://app.codecov.io/gh/JulianSchmid/etherparse/pull/45?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Julian+Schmid#diff-c3JjL2ludGVybmV0L2lwdjRfZXh0ZW5zaW9ucy5ycw==) | `100.00% <ø> (ø)` | | | [src/internet/ipv6.rs](https://app.codecov.io/gh/JulianSchmid/etherparse/pull/45?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Julian+Schmid#diff-c3JjL2ludGVybmV0L2lwdjYucnM=) | `100.00% <ø> (ø)` | | | [src/internet/ipv6\_extensions.rs](https://app.codecov.io/gh/JulianSchmid/etherparse/pull/45?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Julian+Schmid#diff-c3JjL2ludGVybmV0L2lwdjZfZXh0ZW5zaW9ucy5ycw==) | `100.00% <ø> (ø)` | | | [src/internet/ipv6\_fragment.rs](https://app.codecov.io/gh/JulianSchmid/etherparse/pull/45?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Julian+Schmid#diff-c3JjL2ludGVybmV0L2lwdjZfZnJhZ21lbnQucnM=) | `100.00% <ø> (ø)` | | | [src/internet/ipv6\_raw\_extension.rs](https://app.codecov.io/gh/JulianSchmid/etherparse/pull/45?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Julian+Schmid#diff-c3JjL2ludGVybmV0L2lwdjZfcmF3X2V4dGVuc2lvbi5ycw==) | `97.87% <0.00%> (ø)` | | | [src/link/ethernet.rs](https://app.codecov.io/gh/JulianSchmid/etherparse/pull/45?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Julian+Schmid#diff-c3JjL2xpbmsvZXRoZXJuZXQucnM=) | `100.00% <ø> (ø)` | | | [src/link/vlan\_tagging.rs](https://app.codecov.io/gh/JulianSchmid/etherparse/pull/45?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Julian+Schmid#diff-c3JjL2xpbmsvdmxhbl90YWdnaW5nLnJz) | `100.00% <ø> (ø)` | | | ... and [6 more](https://app.codecov.io/gh/JulianSchmid/etherparse/pull/45?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Julian+Schmid) | | ... and [177 files with indirect coverage changes](https://app.codecov.io/gh/JulianSchmid/etherparse/pull/45/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Julian+Schmid)

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