Rename downloaders

[leruaa]

Closes #1076

[gakonst]

LGTM - nice work.

[codecov-commenter]

Codecov Report

Merging #1108 (c199074) into main (5c32ad0) will increase coverage by 0.05%.
The diff coverage is 82.75%.

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@@            Coverage Diff             @@
##             main    #1108      +/-   ##
==========================================
+ Coverage   74.63%   74.69%   +0.05%     
==========================================
  Files         323      323              
  Lines       34956    34998      +42     
==========================================
+ Hits        26089    26141      +52     
+ Misses       8867     8857      -10     

Flag	Coverage Δ
unit-tests	74.69% <82.75%> (+0.05%)	⬆️

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

Impacted Files	Coverage Δ
bin/reth/src/node/mod.rs	0.00% <0.00%> (ø)
bin/reth/src/stage/mod.rs	0.00% <0.00%> (ø)
crates/stages/src/lib.rs	100.00% <ø> (ø)
...tes/net/downloaders/src/headers/reverse_headers.rs	76.14% <84.61%> (ø)
crates/net/downloaders/src/bodies/bodies.rs	87.87% <100.00%> (ø)
crates/net/downloaders/src/bodies/task.rs	95.78% <100.00%> (ø)
crates/net/downloaders/src/headers/task.rs	85.10% <100.00%> (ø)
crates/stages/src/stages/headers.rs	94.89% <100.00%> (ø)
crates/net/network/src/manager.rs	48.20% <0.00%> (+0.19%)	⬆️
crates/stages/src/stages/sender_recovery.rs	91.39% <0.00%> (+0.53%)	⬆️
... and 3 more

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