Support load_adapters with just adapter_name
Signed-off-by: smajumdar <smajumdar@nvidia.com>

# What does this PR do ?

Adds support for load_adapters to load any module adapter with just the adapter_name

**Collection**: [Core, ASR]

# Changelog 
- Update code and tests

# Usage
```python
model = ModelWithAdapterSupport()
model.add_adapters("module:adapter_name", adapter_cfg)
model.save_adapters("adapters.pt")

new_model = ModelWithAdaptersSupport()
new_model.load_adapters("adapters.pt", name="adapter_name")
```

**PR Type**:
- [x] New Feature
- [ ] Bugfix
- [ ] Documentation
