Add multi-method support for ETRecord edge dialect programs

[larryliu0820]

Summary:
ETRecord previously only supported a single edge dialect program (defaulting to
the "forward" method). This change adds support for multiple methods like
vision_encoder, token_embedding, and text_decoder that are used in VLM exports.

The edge_dialect_program field can now be either a single ExportedProgram (for
backward compatibility) or a Dict[str, ExportedProgram] mapping method names to
their exported programs.

Key changes:

• Updated ETRecord to accept Dict[str, ExportedProgram] for edge_dialect_program
• Modified _process_edge_dialect_program to extract all methods from EdgeProgramManager
• Updated save/parse logic to handle multi-method format with backward compatibility
• New format uses paths like edge_dialect_exported_program/{method_name}

Authored with Claude Code.

Differential Revision: D92215098

[pytorch-bot]

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❌ 7 New Failures

As of commit b1c12b6 with merge base c0cef6c ():

NEW FAILURES - The following jobs have failed:

• Build documentation / build (buck2) / Build doc (gh)
  RuntimeError: Command docker exec -t 32db7946489e1a2ff81cf556bf2254b493f11ee0916a48a08d4852f6d73a73e9 /exec failed with exit code 2
• pull / test-samsung-models-linux / linux-job (gh)
  RuntimeError: Command docker exec -t 2345ed03fea95b205c2ef8b11558d863673b9d182fdd54a4122c293050b3d09f /exec failed with exit code 1
• pull / test-samsung-quantmodels-linux / linux-job (gh)
  RuntimeError: Command docker exec -t ac67ec53469d57113d314c693edc1d8f89eff2e8d9bca79f19b050c419010e90 /exec failed with exit code 1
• pull / unittest / linux / linux-job (gh)
  devtools/inspector/tests/inspector_utils_test.py::TestETRecord::test_executorch_export_etrecord_with_to_edge_flow_save_and_parse
• pull / unittest-arm-backend-with-no-deps (test_pytest_models_tosa) / linux-job (gh)
  RuntimeError: Command docker exec -t 1028bf196acda614cbaa7ed72a48e4154b27cb5b981b659bdde50f77346dd58d /exec failed with exit code 1
• pull / unittest-editable / linux / linux-job (gh)
  devtools/inspector/tests/inspector_utils_test.py::TestETRecord::test_executorch_export_etrecord_with_to_edge_flow_save_and_parse
• Test CUDA Builds / test-model-cuda-e2e (mistralai, Voxtral-Mini-3B-2507, quantized-int4-tile-packed) / linux-job (gh)
  RuntimeError: Command docker exec -t 21ad57016d462fc987ff18af1c1d873a5474eac54513dbea9199772de906e75e /exec failed with exit code 1

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