[GOBBLIN-344] Fix help method getResolver in LineageInfo is private

[zxcware]

Dear Gobblin maintainers,

JIRA

• My PR addresses the following Gobblin JIRA issues and references them in the PR title.
  • https://issues.apache.org/jira/browse/GOBBLIN-344

Description

• Here are some details about my PR:
  • In the PR [GOBBLIN-334] Implement SharedResourceFactory for LineageInfo #2187, I mistakenly made help method LineageInfo#getResolver private. It should be public.

Tests

• My PR does not need testing for this extremely good reason:
  • No logic change at all

Commits

• My commits all reference JIRA issues in their subject lines, and I have squashed multiple commits if they address the same issue. In addition, my commits follow the guidelines from "How to write a good git commit message":
  1. Subject is separated from body by a blank line
  2. Subject is limited to 50 characters
  3. Subject does not end with a period
  4. Subject uses the imperative mood ("add", not "adding")
  5. Body wraps at 72 characters
  6. Body explains "what" and "why", not "how"

[zxcware]

@htran1 Please review

[htran1]

+1.