Performance: Optimize .nemo tar extraction & model config processing

[paulirish]

What does this PR do ?

Optimizes model loading performance for ASR models, specifically reducing Canary's setup time by ~44% (from 41.1s to 23.1s) through optimized config processing and eliminating redundant archive extractions.

Collection: [ASR]

Changelog

• Prevent EncDecMultiTaskModel from re-extracting tarballs when they are already handled by nemo.utils.model_utils.
• Optimized nemo.utils.model_utils.maybe_update_config_version and convert_model_config_to_dict_config to support in-place updates via a make_copy parameter, avoiding expensive OmegaConf deep copies.
• Updated Serialization and FileIO mixins in nemo.core.classes.common to use non-copying config conversions where safe.
• Enabled in-place config resolution in EncDecMultiTaskModel, EncDecCTCModelBPE, and EncDecHybridRNNTCTCBPEModel.

Measured performance gains on Canary model load:
- Baseline: 41.1s
- After config optimizations: 32.9s (~20% improvement)
- After just tar extraction fix: 25.6s (~37% improvement)
- Combined: 23.1s (~44% improvement)

These two commits are separate and I'm happy to drop one.

Usage

No changes to public APIs. Models will load significantly faster.

from nemo.collections.asr.models import EncDecMultiTaskModel
# This call is now ~18s faster for Canary
model = EncDecMultiTaskModel.from_pretrained("nvidia/canary-1b-v2")

See #15240 for a more complete repro script

Before your PR is "Ready for review"

Pre checks:

• Make sure you read and followed Contributor guidelines
• Did you write any new necessary tests?
  • No, as the existing tests cover loading
• Did you add or update any necessary documentation?
  • Nope.
• Does the PR affect components that are optional to install?
  • No.

PR Type:

• New Feature
• Bugfix
• Documentation

--

fixes #15240 cc @nithinraok

[nithinraok]

@paulirish Thanks for the great PR, really appreciate it.

Made some comments.

[nithinraok]

For fixing format checker for CI-CD test, pls run:

python setup.py style --scope=<filepath> --fix

(we are working on improving contributing guide)

[paulirish]

@nithinraok thank you.
I did much of the same over the weekend but my simplification wasn't as effective as yours, so I appreciate you stepping in.

[nithinraok]

@nithinraok thank you. I did much of the same over the weekend but my simplification wasn't as effective as yours, so I appreciate you stepping in.

Thanks @paulirish. Appreciate it. Delay in CI due to many open PRs, Will take care of this PR. :)