Support hundredths decimal place in issue weights

Overview

Issue weight is a useful way of depicting the cost or complexity of an issue, but it's limited to non-negative integers.

Some frameworks like WSJF require fractional weights, so some users have to use annoying workarounds like multiplying all weights by 10x or 100x.

Proposal

• Support two decimal places in weight fields. (e.g. accept 1.55 as a weight, but return an error for 1.558)