sagemathgh-37881: Implement hypergeometric Euler factors for tame primes

    
We continue the port of hypergeometric motives from Magma by
implementing the computation of hypergeometric traces and Euler factors
for tame primes. This splits into two essentially separate cases: when t
has nonzero p-adic valuation ("tame"), and when t-1 has nonzero p-adic
valuation ("multiplicative"). In the second case, the computation uses
the local functional equation as in the good reduction case.
    
URL: sagemath#37881
Reported by: kedlaya
Reviewer(s): kedlaya, Travis Scrimshaw