[#964] feat: 14 decimal places for prices in db

[chedieck]

Related to #964

Description

Updates DB to have 14 decimal digits for price values.

Test plan

1. After checking out this branch, enter the paybutton-dev container (yarn docker ns) and run yarn prisma migrate dev
2. Verify Price entries in the database now have 14 decimal digits. These digits so far should be the same as before, but padded with 6 extra zeroes.
3. Again inside the payubutton-dev container, run yarn updateAllPrices. Confirm you want to update the prices.
4. Check the Price db now. The entries now should have the complete 14 digits information, not only the 0-padded values of before.

Remarks

Many prices do actually end with some zeroes at the end, especially the BCH prices which at the least will have 3 right side zeroes. To see prices that should have 14 significant decimal digits:
select * from Price where networkId = 1 order by timestamp desc limit 16;