PAN: revamp application definitions

[sfraint]

Add new VS datamodel representation for Palo Alto applications.

---

Will separately:

1. plumb the new representation into conversion & remove the old representation
2. add a script / instructions for updating these.

[batfish-bot]

This change is 

[sfraint]

Reviewable status: 0 of 12 files reviewed, 1 unresolved discussion (waiting on @arifogel and @dhalperi)

---

projects/batfish/src/main/java/org/batfish/representation/palo_alto/application_definitions/ApplicationDefinition.java, line 37 at r1 (raw file):

  }

  @Nullable

It's not 100% clear to me what some of these properties mean, but we can fill in details as we learn more.

These properties do seem relevant to building a correct hierarchy of apps and understanding interactions, so I went ahead and added them to this new model.

Code quote:

  @Nullable
  public String getParentApp() {
    return _parentApp;
  }

  @Nullable
  public UseApplications getUseApplications() {
    return _useApplications;
  }

  @Nullable
  public UseApplications getImplicitUseApplications() {
    return _implicitUseApplications;
  }

[dhalperi]

Reviewed 12 of 12 files at r1, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @arifogel)

[codecov]

Codecov Report

Merging #8178 (e224369) into master (2c5df7f) will decrease coverage by 0.00%.
The diff coverage is 69.69%.

@@             Coverage Diff              @@
##             master    #8178      +/-   ##
============================================
- Coverage     74.49%   74.49%   -0.01%     
- Complexity    43364    43392      +28     
============================================
  Files          3376     3381       +5     
  Lines        169538   169625      +87     
  Branches      20295    20301       +6     
============================================
+ Hits         126294   126358      +64     
- Misses        33556    33573      +17     
- Partials       9688     9694       +6     

Impacted Files	Coverage Δ
...pplication_definitions/ApplicationDefinitions.java	0.00% <0.00%> (ø)
..._alto/application_definitions/UseApplications.java	78.94% <78.94%> (ø)
...application_definitions/ApplicationDefinition.java	87.50% <87.50%> (ø)
...tation/palo_alto/application_definitions/Port.java	90.90% <90.90%> (ø)
...ion/palo_alto/application_definitions/Default.java	100.00% <100.00%> (ø)
...src/main/java/org/batfish/coordinator/PoolMgr.java	59.52% <0.00%> (-1.20%)	⬇️
...batfish/src/main/java/org/batfish/main/Driver.java	48.00% <0.00%> (-0.45%)	⬇️
...ain/java/org/batfish/storage/FileBasedStorage.java	86.08% <0.00%> (-0.25%)	⬇️
...org/batfish/representation/frr/FrrConversions.java	88.53% <0.00%> (-0.24%)	⬇️
...ain/java/org/batfish/client/BfCoordWorkHelper.java	52.65% <0.00%> (-0.21%)	⬇️
... and 8 more

[sfraint]

Reviewed 1 of 1 files at r2, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @arifogel)