1039 make Operator more extensible

[eparovyshnaya]

add listener for license issuing, call when all license files are successfully persisted

[codecov]

Codecov Report

Merging #1048 (3909754) into master (d507766) will decrease coverage by 0.02%.
The diff coverage is 0.00%.

@@             Coverage Diff              @@
##             master    #1048      +/-   ##
============================================
- Coverage     33.38%   33.35%   -0.03%     
  Complexity      346      346              
============================================
  Files          1150     1151       +1     
  Lines         25419    25439      +20     
  Branches       1574     1576       +2     
============================================
  Hits           8485     8485              
- Misses        16430    16449      +19     
- Partials        504      505       +1     

Impacted Files	Coverage Δ
...nses/core/ContributedLicensePackIssueListener.java	0.00% <0.00%> (ø)
...c/internal/licenses/core/IssueFloatingLicense.java	0.00% <0.00%> (ø)
...c/internal/licenses/core/IssuePersonalLicense.java	0.00% <0.00%> (ø)
...bc/internal/base/acquire/DefaultGrantsStorage.java	76.27% <0.00%> (-1.70%)	⬇️
...rg/eclipse/passage/lic/bc/BcResidentSecretKey.java	95.65% <0.00%> (+4.34%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update d507766...3909754. Read the comment docs.

[ruspl-afed]

We had such an event on event bus some time ago but now I'm not sure