Different rate limiter for calibnet and mainnet

[sudo-shashank]

Summary of changes

Changes introduced in this pull request:

• Independent rate limitter for calibnet(60secs) and mainnet(600 secs)

Reference issue to close (if applicable)

Closes #137

Other information and links

Change checklist

• I have performed a self-review of my own code,
• I have made corresponding changes to the documentation. All new code
  adheres to the team's
  documentation standards,
• I have added tests that prove my fix is effective or that my feature works
  (if possible),
• I have made sure the CHANGELOG is up-to-date. All user-facing changes
  should be reflected in this document.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 30 lines in your changes missing coverage. Please review.

Project coverage is 9.83%. Comparing base (88f8587) to head (84812ec).

Files with missing lines	Patch %	Lines
src/faucet/utils.rs	0.00%	12 Missing ⚠️
src/rate_limiter.rs	0.00%	12 Missing ⚠️
src/faucet/controller.rs	0.00%	4 Missing ⚠️
src/faucet/views.rs	0.00%	2 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##            main    #142      +/-   ##
========================================
- Coverage   9.95%   9.83%   -0.12%     
========================================
  Files         25      25              
  Lines       1296    1311      +15     
========================================
  Hits         129     129              
- Misses      1167    1182      +15     

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