Metric name validation does not match server #863

Description of Bug

Trying to create metrics from RemKiT variables gives errors like:

[1, 'e-i_odd_C1Il+2_h=2Ion', '[key]']              │ str != string_pattern_mismatch │ String should match pattern '^[a-zA-Z0-9\\-\\_\\s\\/\\.:=><]+$'

Checked with Andrew, the server validation is:
^[a-zA-Z0-9\-\_\s\/\.:=><+\(\)]+$
Whereas in the Python API it is:
METRIC_KEY_REGEX: str = r"^[a-zA-Z0-9\-\_\s\/\.:=><]+$"
Need to change this to match the server version

Steps To Reproduce

Steps to reproduce the behavior:

1. Try to create a metric with a '+' in the name

Expected behavior

Name should be accepted

Actual Behaviour

Name is rejected due to failing validation

Setup

• OS: Ubuntu
• Python version: 3.11