### Summary

I'm trying to optimise my builds by avoiding unnecessary downloads.
ansible-galaxy install always downloads the latest version even if the existing collection already meets the requirements. This behaviour appears to be consistent with the documentation (https://docs.ansible.com/ansible/latest/galaxy/user_guide.html#installing-an-older-version-of-a-collection), but why has it been implemented to always download ?


e.g. I have
```
# /usr/local/lib/python3.8/site-packages/ansible_collections
Collection                    Version
----------------------------- -------
amazon.aws                    3.5.0  
...
```
and requirements.yml
```
---
collections:
  - name: amazon.aws
    version: '>=1.5.0'
```
if I run ansible-galaxy install -r requirements.yml I get amazon.aws 6.1.0 installed, even though 3.5.0 already meets my 1.5.0 requirement. I would expect nothing to happen because my requirements were already met.

### Issue Type

Feature Idea

### Component Name

ansible galaxy

### Additional Information

People who like the existing behaviour could perhaps use the recently added --upgrade switch to continue to get the upgrade to the lastest version.

### Code of Conduct

- [X] I agree to follow the Ansible Code of Conduct
b_file_path = to_bytes(os.path.join(to_text(b_path), filename), errors='surrogate_or_strict')
    if not os.path.isfile(b_file_path):
        actual_hash = None
    else:
        with open(b_file_path, mode='rb') as file_object:
            actual_hash = _consume_file(file_object)
    if expected_hash != actual_hash:
        error_queue.append(ModifiedContent(filename=filename, expected=expected_hash, installed=actual_hash))
def _make_manifest():
    return {
        'files': [
            {
                'name': '.',
                'ftype': 'dir',
                'chksum_type': None,
                'chksum_sha256': None,
                'format': MANIFEST_FORMAT,
            },
        ],
        'format': MANIFEST_FORMAT,
    }
def _make_entry(name, ftype, chksum_type='sha256', chksum=None):