Enhance License Detection and Filename Handling for Github /api/collect/

purl: pkg:github/adobe/aa-client-go@0.9.1

The /api/collect/ for the above purl return the following:
```
[
{
"url": "http://127.0.0.1:8001/api/packages/a89afb01-95f2-4772-89ea-1b0bfe9c5414/",
"uuid": "a89afb01-95f2-4772-89ea-1b0bfe9c5414",
"filename": "v0.9.1.tar.gz",
"package_sets": [
{
"uuid": "d1aa0772-5229-474b-af0d-67aab85d8f70",
"packages": [
"http://127.0.0.1:8001/api/packages/a89afb01-95f2-4772-89ea-1b0bfe9c5414/",
"http://127.0.0.1:8001/api/packages/43ad836e-08d0-4895-bfd4-1de8a77f3141/"
]
}
],
"package_content": null,
"purl": "pkg:github/adobe/aa-client-go@0.9.1",
"type": "github",
"namespace": "adobe",
"name": "aa-client-go",
"version": "0.9.1",
"qualifiers": "",
"subpath": "",
"primary_language": "Go",
"description": null,
"release_date": "2021-08-18T08:59:53Z",
"parties": [],
"keywords": [],
"homepage_url": null,
"download_url": "https://github.com/adobe/aa-client-go/archive/refs/tags/v0.9.1.tar.gz",
"bug_tracking_url": "https://github.com/adobe/aa-client-go/issues",
"code_view_url": "https://github.com/adobe/aa-client-go",
"vcs_url": "git://github.com/adobe/aa-client-go.git",
"repository_homepage_url": null,
"repository_download_url": null,
"api_data_url": null,
"size": null,
"md5": null,
"sha1": null,
"sha256": null,
"sha512": null,
"copyright": null,
"holder": null,
"declared_license_expression": null,
"declared_license_expression_spdx": null,
"license_detections": [],
"other_license_expression": null,
"other_license_expression_spdx": null,
"other_license_detections": [],
"extracted_license_statement": null,
"notice_text": null,
"source_packages": [],
"extra_data": {},
"package_uid": "pkg:github/adobe/aa-client-go@0.9.1?uuid=a89afb01-95f2-4772-89ea-1b0bfe9c5414",
"datasource_id": null,
"file_references": [],
"dependencies": [],
"resources": "http://127.0.0.1:8001/api/packages/a89afb01-95f2-4772-89ea-1b0bfe9c5414/resources/",
"history": "http://127.0.0.1:8001/api/packages/a89afb01-95f2-4772-89ea-1b0bfe9c5414/history/"
}
]
```

The tool should fetch the license information from github's API ( https://api.github.com/repos/adobe/aa-client-go ) i.e.
```
"license": {
"key": "apache-2.0",
"name": "Apache License 2.0",
"spdx_id": "Apache-2.0",
"url": "https://api.github.com/licenses/apache-2.0",
"node_id": "MDc6TGljZW5zZTI="
},
```

In addition, we should use the actual filename from the downloaded file from the download_url
For instance,
```
"download_url": "https://github.com/adobe/aa-client-go/archive/refs/tags/v0.9.1.tar.gz",
```
The actual filename should be `aa-client-go-0.9.1.tar.gz` instead of `v0.9.1.tar.gz`