What is our API surface?

[nciric]

We started discussing use cases and potential lexicon format in #1 . Let's move details of API design to a separate issue (this one).

From my end I see the following use cases:

1. Inflecting a single word in a message format, from base form with provided grammatical information, e.g. icu.inflect("sr-Latn", "Beograd", options { "vocative", "singular" }) -> "Beograde" . Necessary grammatical information for "Beograd", like gender, inanimate etc, would be pulled from a lexicon.
2. For a given word, find its lemma and grammatical info.
3. For a word not in a lexicon, try to "guess" its inflected form, based on rules and/or similarity to other words in the dictionary.
4. Optional - try to align multiple related words, e.g. inflect adjectives and corresponding noun to form grammatically sound whole - big red apple. In case of English reorder the adjectives?