feat (encodeFasta): encodeFasta added to encode fasta header

[zhuchcn]

The command encodeFasta is added. It takes 1 input and 1 output. For example:

moPepGen encodeFasta -i variant.fasta -o encoded.fasta

Example of encoded FASTA:

>563744e3-f6c9-4dcf-8436-2f54bf670294
FKFMTRR
>ce6f97ce-34a9-413b-b94d-55b9732ff36a
ERERLYLCGVTGSPTENCAK
>27456aec-1705-4aa7-860d-aff91082c67b
GQQPCTVAEGRCLTCEPGWNRTK
>fc79213d-bc3b-485a-b246-baf5065f6bce
KPLVVDISER
>62529d60-5d4c-476b-a302-c7638f0c57fc
MFKFMAR

It also writes a dict file with a suffix of .dict added to the output file specified. So the in the example above, the dict file name is encoded.fasta.dict

$ head encode.fasta.dict
563744e3-f6c9-4dcf-8436-2f54bf670294    CIRC-ENST00000614167.2-E1-E2|27
ce6f97ce-34a9-413b-b94d-55b9732ff36a    CIRC-ENST00000614167.2-E1-E2|77
27456aec-1705-4aa7-860d-aff91082c67b    ENST00000622235.5|RES-202-G-A|3
fc79213d-bc3b-485a-b246-baf5065f6bce    CIRC-ENST00000614167.2-E1-E2|58
62529d60-5d4c-476b-a302-c7638f0c57fc    CIRC-ENST00000614167.2-E1-E2|RES-101-A-G|1 CIRC-ENST00000614167.2-E1-E2|RES-101-A-G|2

Closes #365

[lydiayliu]

Just thought of this, do we need to pair this with a decodeFasta? Anybody should be able to use the dict as a lookup table? XD

[zhuchcn]

I thought about this! But just not sure how useful it would be. It's really easy to implement so maybe we can do that once we find it's useful.