feat: add encoded_length to ValidPoolTransaction

[leruaa]

#1500 followup.

@mattsse any hint on where this new encoded_length should be used?

[mattsse]

lgtm

we need this for #1484

[mattsse]

we can also change what fn size returns and use the encoded_length instead, because this is more accurate than the num of bytes of the tx data.

[codecov-commenter]

Codecov Report

Merging #1512 (359703a) into main (8094ab1) will increase coverage by 0.00%.
The diff coverage is 100.00%.

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@@           Coverage Diff           @@
##             main    #1512   +/-   ##
=======================================
  Coverage   76.07%   76.07%           
=======================================
  Files         358      358           
  Lines       42759    42764    +5     
=======================================
+ Hits        32528    32534    +6     
+ Misses      10231    10230    -1     

Flag	Coverage Δ
integration-tests	21.83% <40.00%> (+0.01%)	⬆️
unit-tests	70.54% <100.00%> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
crates/transaction-pool/src/pool/mod.rs	45.33% <100.00%> (+0.46%)	⬆️
crates/transaction-pool/src/test_utils/mock.rs	68.15% <100.00%> (+1.25%)	⬆️
crates/transaction-pool/src/validate.rs	52.23% <100.00%> (+0.72%)	⬆️
crates/net/network/src/session/mod.rs	76.59% <0.00%> (-1.36%)	⬇️
crates/stages/src/stages/sender_recovery.rs	90.95% <0.00%> (-0.54%)	⬇️
crates/stages/src/stages/hashing_storage.rs	95.65% <0.00%> (-0.28%)	⬇️
crates/net/discv4/src/lib.rs	66.23% <0.00%> (+0.07%)	⬆️
crates/net/eth-wire/src/ethstream.rs	84.21% <0.00%> (+0.23%)	⬆️
crates/net/network/src/session/active.rs	85.33% <0.00%> (+0.74%)	⬆️

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