implement templates for reference file system

[magland]

Implements the use of templates in reference file system as in fsspec, but does not support the full jinja2 templating.

For example,

{
    "templates": {"u1": "https://some/url", "u2": "https://some/other/url"},
    "refs": {
        ... "/some/key/0": [
            "{{u1}}" 0, 100
        ],
        ...
    }
}

In this case, the "{{u1}}" will be replaced with the value of the "u1" template string.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 91.66667% with 3 lines in your changes are missing coverage. Please review.

Project coverage is 82.55%. Comparing base (bc71a9d) to head (d47fd19).

Files	Patch %	Lines
lindi/LindiH5pyFile/LindiH5pyFile.py	0.00%	2 Missing ⚠️
...ndi/LindiH5pyFile/LindiReferenceFileSystemStore.py	96.87%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #51      +/-   ##
==========================================
+ Coverage   82.33%   82.55%   +0.21%     
==========================================
  Files          25       25              
  Lines        1715     1748      +33     
==========================================
+ Hits         1412     1443      +31     
- Misses        303      305       +2     

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