feat: add in-toto/in-toto-golang

[in-toto/in-toto-golang](https://github.com/in-toto/in-toto-golang): A Go implementation of in-toto. in-toto is a framework to protect software supply chain integrity

```console
$ aqua g -i in-toto/in-toto-golang
```

## How to confirm if this package works well

Reviewers aren't necessarily familiar with this package, so please describe how to confirm if this package works well.
Please confirm if this package works well yourself as much as possible.

Command and output

```console
$
```

If files such as configuration file are needed, please share them.

```
```

Reference

-

pkgs/in-toto/in-toto-golang/pkg.yaml

@@ -0,0 +1,2 @@
+packages:
+  - name: in-toto/in-toto-golang@v0.5.0

pkgs/in-toto/in-toto-golang/registry.yaml

@@ -0,0 +1,7 @@
+packages:
+  - type: go_install
+    repo_owner: in-toto
+    repo_name: in-toto-golang
+    description: A Go implementation of in-toto. in-toto is a framework to protect software supply chain integrity
+    files:
+      - name: in-toto