New KD methods, updated YAML constructors, and low-level loss support

New methods

• Add SRD method (PRs #436, #444, #446)
• Add Knowledge Distillation from A Stronger Teacher method (PR #433)
• Add Inter-Channel Correlation for Knowledge Distillation method (PR #432)

YAML constructor

• Update functions in yaml_util (PR #447)
• Fix docstrings and add import_call_method & yaml constructor (PR #442)

Distillation/Training boxes

• Enable auxiliary model wrapper builder to redesign input model (PR #437)

Registries

• Add low-level registry and get functions (PR #426)

Documentation

• Update benchmarks (PR #435)
• Fix a typo (PR #424)

Examples

• Replace dst with src (Issue roymiles/Simple-Recipe-Distillation#1, PR #445)
• Add Amazon SageMaker Studio Lab badges (PR #422)

Tests

• Add a test case for import_call_method (PR #443)
• Add import test (PR #441)

Misc

• Update citation info (PRs #438, #439, #440)
• Update publication links (PR #430)
• Update version (PR #425, #449, #451)
• Update README (PRs #423, #434, #450)
• Update image url (PR #421)