feat!: migrate to Jackson 3

[marevol]

Summary

Moves jackson-databind to the tools.jackson.core groupId at ${jackson.version} and updates the three extractors that use Jackson.

Source changes

Jackson 3 is not only a package rename here -- three APIs this repository relies on changed shape:

TokenStreamFactory is immutable. HtmlExtractor and JsonExtractor hardened their mappers by calling mapper.getFactory().setStreamReadConstraints(...) after construction, which Jackson 3 no longer allows. Both now build the factory first and pass it to the mapper:

objectMapper = new ObjectMapper(JsonFactory.builder().streamReadConstraints(constraints).build());

The configured limits (max nesting depth, max string length, max number length) are unchanged, so the protection against hostile input is identical.

JsonNode.fields() was removed, replaced by properties(). JsonExtractor.extractObject keeps iterating over an Iterator rather than switching to forEach, so its maxTextLength early exit still applies mid-object.

JsonProcessingException is gone and its replacement JacksonException is unchecked, which left JsonExtractor's catch (IOException) unreachable. It now catches JacksonException and still raises ExtractException("Failed to parse JSON content", e), so a malformed document is reported exactly as before. HtmlExtractor's JSON-LD handler catches JacksonException ahead of its existing catch (RuntimeException).

Verification

• mvn test: 2097 tests, 0 failures, 0 errors
• The three touched extractors' own suites pass: JsonExtractorTest (14), HtmlExtractorTest (55), PasswordBasedExtractorTest (18)

Merge order

Requires codelibs/fess-parent (jackson.version -> 3.2.1) to merge first.