Fixes #28254.

migrated all files and references from org/torproject/onionoo to org/torproject/metrics/onionoo; added package-info.java for all new packages

Avoids parse issues with previously deprecated and later removed
fields like "as_number" in details documents.

Still related to #23713.

This commit actually only disables the "fingerprint" parameter. Even
though we gave people a 1 month warning, it might happen that somebody
comes along next week and tells us their truly important use case why
they still need this parameter. Once we're really sure this won't
happen, we can rip out some more code that was necessary to implement
this parameter.

Implements #26919.

Implements #25175.

Implements #25177.

Changes the current behavior of the "version" parameter by moving away
from string prefix matching to actually parsing provided (partial)
versions. As a result, for example, "version=0.3.2.1" doesn't
magically include versions 0.3.2.10 to 0.3.2.19, 0.3.2.100 to
0.3.2.199, etc. anymore. Without this change, version ranges would
have become just too confusing. The downside is that this change
requires a major version bump.

Implements #6947.

 * AS0 is an allowed value. This is used for unknown AS numbers.
 * Leading zeros are stripped from the AS number.
 * If an AS number is larger than the maximum possible (in 32-bits)
   then this will be treated as an error.
 * Tests are increased to cover additional cases.

Fixes: #27163

Fixes #27039.

Resolves #26969.

Implements the first part of #26919, which is to find out whether the
"fingerprint" parameter is used at all.

Implements the last part of #23713.

Implements another part of #23713.

Implements part of #23713.

Implements #25448.

The filter is applicable to both bridges and relays. It uses basic
string operations to extract the operating system from the platform line
of descriptors.

Fixes: #6946

A missing descriptor directory has caused an IllegalStateException
when we attempted to write our parse history files. Let's be more
careful about this case and skip this history file if there is no such
directory.

Fixes #26711.

Indexes are created for relays with no known country code or
autonomous system number using the special values "xz" and "AS0"
respectively.

No changes are made to the summary or details documents.

Fixes: #26665

This commit adds two new fields: {un,}verified_host_names.

Whereas previously InetAddress was used to resolve reverse domain
names, this instead changes the lookup mechanism to use JNDI allowing
for a deeper view into the DNS. It also accounts for the fact that
multiple PTR records are not forbidden in the DNS specification and are
often used in shared hosting scenarios.

A host name is considered verified if it has a matching forward record.
If a PTR value is found to have multiple A records, it will be
considered verified if any one of the A records matches the original
address. If no matching record is found, it will be reported as an
unverified host name.

Previously, unverified host names were discarded internally by the
InetAddress lookup mechanism and so this data could not be used.

To maintain "bug compatibility" with the previous implementation of the
"host_name" field, which will now be deprecated, the IP address is
returned when a lookup fails.

The host_name field continues to be used, but now will consider all
verified and unverified host names. If finer grained filtering is
needed, then a seperate ticket could be filed for that, but it is
unclear that it is useful enough to justify the work.

Fixes: #18342

Update metrics-lib dependency to 2.4.0.

Adapt touched logging statements to our standards.

Implements #25848.

Fixes #25332.

Also adapt tests to check the new functionality.
Implements task-25740.

Fixes #25700.

Implements #24256.

Add a utility method for only un-escaping valid utf and supply a test
as well as test data for this issue.

Fixes task-22594.