feat: Support scanning license files in golang packages over the network (#1630)

Signed-off-by: Avi Deitcher <avi@deitcher.net>
Signed-off-by: Keith Zantow <kzantow@gmail.com>
Signed-off-by: Alex Goodman <alex.goodman@anchore.com>
Co-authored-by: Keith Zantow <kzantow@gmail.com>
Co-authored-by: Alex Goodman <alex.goodman@anchore.com>

syft/pkg/cataloger/golang/test-fixtures/repo/LICENSE

@@ -0,0 +1,7 @@
+Copyright (c) 2022
+Acme, inc.
+
+Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
+
+Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
+THIS SOFTWARE IS PROVIDED BY [Name of Organization] “AS IS” AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL [Name of Organisation] BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

syft/pkg/cataloger/golang/test-fixtures/zip-fs/github.com/someorg/somepkg@version/a-file

@@ -0,0 +1 @@
+a file

syft/pkg/cataloger/golang/test-fixtures/zip-fs/github.com/someorg/somepkg@version/subdir/subfile

@@ -0,0 +1 @@
+another file