jackson-parquet doesn't shade ServiceLoader discovery files

[LDVSOFT]

Describe the bug, including details regarding any error messages, version, and platform.

If you peek inside parquet-jackson jar you can easily find under META-INF/services/ a couple of services like META-INF/services/com.fasterxml.jackson.core.JsonFactory. Both the offered service name and implementing classes inside aren't shaded.

This doesn't seem to break the code itself, but does raise a couple of concerns:

1. If there is a need in offering services in shaded Jackson, those should be fixed.
2. If there is no such need those can be skipped not to interfere with non-shaded Jackson (however the effect here is minimal, besides just duplicating an entry).

For example, AWS SDK for Java v2 rewrites their services file from Jackson core.

Checked on 1.13.1 and 1.15.2.

Component(s)

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