Expand throttling options for MN operators

[Neurone]

Description:

While configuring the throttling limits as a MN's operator, I want to be able to go down to 1 request per second, but at the moment the MN poses a fixed minimum limit of 100 RPS. This PR fixes that limit.

Related issue(s):

N/A

Notes for reviewer:

N/A

Checklist

• Documented (Code comments, README, etc.)
• Tested (unit, integration, etc.)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.31%. Comparing base (fcd2790) to head (c28bd0c).
Report is 2 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #9976      +/-   ##
============================================
+ Coverage     92.21%   92.31%   +0.09%     
+ Complexity     7840     7737     -103     
============================================
  Files           954      936      -18     
  Lines         32791    32536     -255     
  Branches       4141     4119      -22     
============================================
- Hits          30238    30034     -204     
+ Misses         1581     1535      -46     
+ Partials        972      967       -5     

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