Add incremental converter builder

[cthoyt]

Closes #33, suggested by @kervel

• Add interface for adding a new record
• Add convenience interface for adding a new record by specifying parts (prefix, uri_prefix, syonyms)
• Testing
• Documentation

Demos

New prefixes can be added to an existing converter like in the following:

import curies

converter = curies.get_obo_converter()
converter.add_prefix("hgnc", "https://bioregistry.io/hgnc:")

Similarly, an empty converter can be instantiated using an empty list for the records argument and prefixes can be added one at a time (note this currently does not allow for adding synonyms separately):

import curies

converter = curies.Converter(records=[])
converter.add_prefix("hgnc", "https://bioregistry.io/hgnc:")

[codecov-commenter]

Codecov Report

Merging #34 (6389a29) into main (3bb5fe2) will decrease coverage by 2.41%.
The diff coverage is 75.00%.

@@             Coverage Diff             @@
##              main      #34      +/-   ##
===========================================
- Coverage   100.00%   97.59%   -2.41%     
===========================================
  Files            5        5              
  Lines          267      291      +24     
  Branches        58       66       +8     
===========================================
+ Hits           267      284      +17     
- Misses           0        3       +3     
- Partials         0        4       +4     

Impacted Files	Coverage Δ
src/curies/api.py	96.78% <75.00%> (-3.22%)	⬇️

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[cthoyt]

@kervel please take a look over this and let me know what you think

[kervel]

hello,

i guess i would then use the

    def add_prefix(
        self,
        prefix: str,
        uri_prefix: str,
        prefix_synonyms: Optional[Collection[str]] = None,
        uri_prefix_synonyms: Optional[Collection[str]] = None,
    ) -> None:

this looks totally clear to me!
thanks a lot for this!

Greetings,
Frank