Convert integers to a Base64-encoded VLQ string

from functorflow import ff

r = ff('vlq').encode(123)
print(r) # '2H'

r = ff('vlq').encode([ 123, 456, 789 ])
print(r) # '2HwcqxB'

r = ff('vlq').decode( '2HwcqxB' )
print(r) # [ 123, 456, 789 ]