[mlir] Allow accessing DialectResourceBlobManager::blobMap (cherry-pick)

[andrey-golubev]

Summary

Add a new API to access all blobs that are stored in the blob manager. The main purpose (as of now) is to allow users of dialect resources to iterate over all blobs, especially when the blobs are no longer used in IR (e.g. the operation that uses the blob is deleted) and thus cannot be easily accessed without manual tracking of keys.

JIRA ticket

• E-xxxxx

Related PR in NPU Compiler and/or OpenVINO repository with sub-module update

• [mlir] Allow accessing DialectResourceBlobManager::blobMap llvm/llvm-project#142352

Other related tickets

List tickets for additional work, eg, something was found during review but you agreed to address it in another Jira

• E-xxxxx

[andrey-golubev]

Local testing:

agolubev@irlvmvagolubev:~/npu-plugin-llvm/build$ ninja check-llvm
[691/692] Running the LLVM regression tests
 
Testing Time: 1413.30s
 
Total Discovered Tests: 60818
  Skipped          :    15 (0.02%)
  Unsupported      :  1089 (1.79%)
  Passed           : 59547 (97.91%)
  Expectedly Failed:   167 (0.27%)
 
agolubev@irlvmvagolubev:~/npu-plugin-llvm/build$ ninja check-mlir
[135/136] Running the MLIR regression tests
 
Testing Time: 18.32s
 
Total Discovered Tests: 2903
  Skipped          :    2 (0.07%)
  Unsupported      :  502 (17.29%)
  Passed           : 2398 (82.60%)
  Expectedly Failed:    1 (0.03%)

Given that the change is isolated (unused in MLIR so far), we don't need to run NPU tests.