metrics-ipmi-blobs: Convert to nanopb

Tested: Decoded a metric proto from a host and verified that the fields
all looked as expected and "normal" with decode successfully identifying
everything.

Ch

metrics-ipmi-blobs: Convert to nanopb

Tested: Decoded a metric proto from a host and verified that the fields
all looked as expected and "normal" with decode successfully identifying
everything.

Change-Id: Iaa1b5500db6d1b93fae95d44a1045a858624cc51
Signed-off-by: William A. Kennington III <wak@google.com>

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Adding google license header to source files

This was done automatically using this script:

https://github.com/google/addlicense

```
go get -u github.com/google/addlicense
$HOME/go/bin/addlicense

Adding google license header to source files

This was done automatically using this script:

https://github.com/google/addlicense

```
go get -u github.com/google/addlicense
$HOME/go/bin/addlicense -c "Google LLC" -l apache .
```

Manually added the license headers to meson.build files as well

Signed-off-by: Brandon Kim <brandonkim@google.com>
Change-Id: I7a17364912c8af2317a1d47a4222f7b3bdc5dc98

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metrics-ipmi-blobs: Add from gBMC

Tested: ran CI locally.

1/5 ncsid / iface_test OK 0.01s
2/5 ncsid / sock_test OK 0.02s
3/5 ncsid / normalize_ip_

metrics-ipmi-blobs: Add from gBMC

Tested: ran CI locally.

1/5 ncsid / iface_test OK 0.01s
2/5 ncsid / sock_test OK 0.02s
3/5 ncsid / normalize_ip_test OK 0.02s
4/5 ncsid / normalize_mac_test OK 0.03s
5/5 metrics-ipmi-blobs / gtest test OK 0.01s

Signed-off-by: Sui Chen <suichen@google.com>
Change-Id: Icaf266b170f96b062774c3ef90e59ddec9ea15c6

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