refactor: rename package to @singi-labs/barazo-lexicons (#56)
* refactor: rename package from @singi-labs/lexicons to @singi-labs/barazo-lexicons
Aligns the npm package name with the repo name and differentiates from
@singi-labs/sifa-lexicons. Consumers (barazo-api, barazo-web) updated
in parallel PRs.
* docs: update module docstring for @singi-labs/barazo-lexicons
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