added support for new testnets in blockfrost

[mateusap1]

No description provided.

[codecov-commenter]

Codecov Report

Merging #80 (c469764) into main (e4f9d1c) will increase coverage by 0.01%.
The diff coverage is 71.42%.

@@            Coverage Diff             @@
##             main      #80      +/-   ##
==========================================
+ Coverage   86.00%   86.02%   +0.01%     
==========================================
  Files          23       23              
  Lines        2444     2447       +3     
  Branches      551      551              
==========================================
+ Hits         2102     2105       +3     
  Misses        252      252              
  Partials       90       90              

Impacted Files	Coverage Δ
pycardano/backend/blockfrost.py	30.97% <50.00%> (ø)
pycardano/network.py	86.66% <100.00%> (+3.33%)	⬆️

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[mateusap1]

Not sure if this is the best approach to deal with the new testnets (preprod and review). Another alternative would be to call them all Network.TESTNET (since they share some "testnet" simmilarities like the address format), but require (or allow) user to specify the blockfrost URL.

[mateusap1]

Yeah, I see address derivation is failing with my addition.
Address(payment_vkey.hash(), stake_vkey.hash(), network=Network.PREPROD) is giving a different value from Address(payment_vkey.hash(), stake_vkey.hash(), network=Network.TESTNET) which is not good
Maybe mantaining the same networks, but allowing a custom blockfrost url is actually the best option

[cffls]

Nice, thanks for the change!