Add support for custom source sequences w/ Seq2SeqScorer

[aaronmueller]

Minor update: added support for custom source sequences when using Seq2SeqScorer.

Usage:

from minicons import scorer

s2s_scorer = Seq2SeqScorer("t5-base", "cpu")

source_seqs = ["form question: The man that hasn't seen the yaks has left.", "form question: The man that hasn't seen the yaks has left."]
target_seqs = ["Has the man that hasn't seen the yaks left?", "Hasn't the man that seen the yaks has left?"]

# Optional: use argument `source_format="custom"`
s2s_scorer.sequence_score(target_seqs, source=source_seqs)

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[kanishkamisra]

Looks great! Thanks @aaronmueller!