[GRPC][Term-level queries] Add Exists, Regexp, and Wildcard queries

[karenyrx]

Description

1. Implement Exists, Regexp, Wildcard queries for GRPC.
2. Small fix to make all *ProtoUtils.java classes package private.

Related Issues

Partially resolves #18907

Check List

• Functionality includes testing.
• API changes companion pull request created, if applicable.
• Public documentation issue/PR created, if applicable.

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[github-actions]

❌ Gradle check result for 6200124: FAILURE

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❌ Gradle check result for 143b615: FAILURE

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[github-actions]

❌ Gradle check result for 143b615: FAILURE

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[github-actions]

❌ Gradle check result for 143b615: FAILURE

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❌ Gradle check result for d494f09: FAILURE

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[github-actions]

✅ Gradle check result for ac26ac5: SUCCESS

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 72.96%. Comparing base (2c6a404) to head (e393921).
⚠️ Report is 9 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##               main   #19392    +/-   ##
==========================================
  Coverage     72.95%   72.96%            
- Complexity    70115    70159    +44     
==========================================
  Files          5687     5695     +8     
  Lines        321703   321887   +184     
  Branches      46534    46565    +31     
==========================================
+ Hits         234702   234864   +162     
+ Misses        68074    68073     -1     
- Partials      18927    18950    +23     

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[github-actions]

❌ Gradle check result for 2f81856: FAILURE

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❌ Gradle check result for 4bf9666: FAILURE

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❕ Gradle check result for 21208ce: UNSTABLE

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[github-actions]

✅ Gradle check result for e393921: SUCCESS