analyze: add inspect-elf verb to parse package metadata

analyze: add inspect-elf verb to parse package metadata

Parses and prints package metadata from executables, libraries and core files

$ systemd-analyze inspect-elf /tmp/core ../fsverity-utils/fsverityb /bin/bash --json=off --no-pager
__________________________
           path: /tmp/core
        elfType: coredump
elfArchitecture: AMD x86-64

    module name: /tmp/crash
           type: deb
           name: hello
        version: 1.0
   architecture: amd64
             os: debian
      osVersion: 11
        buildId: b33541096a09c29a0ba4ec5c69364a2711b7c269

    module name: /usr/lib/x86_64-linux-gnu/libc-2.31.so
           type: deb
           name: hello
        version: 1.0
   architecture: amd64
             os: debian
      osVersion: 11
        buildId: 54eef5ce96cf37cb175b0d93186836ca1caf470c

    module name: /usr/lib/x86_64-linux-gnu/ld-2.31.so
           type: deb
           name: hello
        version: 1.0
   architecture: amd64
             os: debian
      osVersion: 11
        buildId: 32438eb3b034da54caf58c7a65446639f7cfe274
__________________________________________________________________
           path: /home/luca/git/systemd/../fsverity-utils/fsverity
        elfType: executable
elfArchitecture: AMD x86-64

           type: deb
           name: fsverity-utils
        version: 1.3-1
   architecture: amd64
             os: debian
   debugInfoUrl: https://debuginfod.debian.net
        buildId: 05b899e6ee0d3653e20458719b202ed3ca8d566f
_________________________
           path: /bin/bash
        elfType: executable
elfArchitecture: AMD x86-64

        buildId: 4fef260f60e257d2dbd4126bf8add83837aea190
$
$ systemd-analyze inspect-elf /tmp/core ../fsverity-utils/fsverity /bin/bash /tmp/core.test-condition.1000.f9b9a84a9fd1482c9702d6afa6f6934b.37640.1637083078000000 --json=pretty --no-pager
{
	"elfType" : "coredump",
	"elfArchitecture" : "AMD x86-64",
	"/home/bluca/git/fsverity-utils/fsverity" : {
		"type" : "deb",
		"name" : "fsverity-utils",
		"version" : "1.3-1",
		"buildId" : "7c895ecd2a271f93e96268f479fdc3c64a2ec4ee"
	},
	"/home/bluca/git/fsverity-utils/libfsverity.so.0" : {
		"type" : "deb",
		"name" : "fsverity-utils",
		"version" : "1.3-1",
		"buildId" : "b5e428254abf14237b0ae70ed85fffbb98a78f88"
	}
}
{
	"elfType" : "executable",
	"elfArchitecture" : "AMD x86-64",
	"/home/bluca/git/systemd/../fsverity-utils/fsverity" : {
		"type" : "deb",
		"name" : "fsverity-utils",
		"version" : "1.3-1",
		"buildId" : "7c895ecd2a271f93e96268f479fdc3c64a2ec4ee"
	}
}
{
	"elfType" : "executable",
	"elfArchitecture" : "AMD x86-64",
	"/bin/bash" : {
		"buildId" : "3313b4cb119dcce16927a9b6cc61dcd97dfc4d59"
	}
}
{
	"elfType" : "coredump",
	"elfArchitecture" : "AMD x86-64"
}