Chore: Make min epoch time in dev smaller

[mustermeiszer]

Description

DefaultMinEpochTime was 5 minutes beforehand. Which made creating pools in dev annoying, as you need to wait 5 minutes to bring in investments. Now, this is all possible in 1 blocks.

Changes and Descriptions

• Change runtime configuration to allow closing multiple epochs per block
• Change runtime configuration to have a minimum default epoch time of 0

Checklist:

• I have added Rust doc comments to structs, enums, traits and functions
• I have made corresponding changes to the documentation
• I have performed a self-review of my code
• I have added tests that prove my fix is effective or that my feature works

[lemunozm]

Now, this is all possible in 2 blocks.

Why 2 blocks and no 1?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 46.76%. Comparing base (4363f8b) to head (4b50c5f).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1872      +/-   ##
==========================================
+ Coverage   46.73%   46.76%   +0.03%     
==========================================
  Files         169      169              
  Lines       13177    13176       -1     
==========================================
+ Hits         6158     6162       +4     
+ Misses       7019     7014       -5     

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[mustermeiszer]

It is possible in one block

[mustermeiszer]

@lemunozm lets see if this goes through #1873