refactor: use type erasure on types with lots of generics

[dancoombs]

Applies this pattern in 3 places:

• Providers for tasks (reused by all tasks)
• UO Pool
• Bundler Proposer

I like the first one, but the second two seem to bring out too much boilerplate and the types aren't reused. Want to see if I can simplify a bit using some sort of composition, but if I can't simplify I may just keep the first one.

[codecov]

Codecov Report

Attention: Patch coverage is 54.76190% with 95 lines in your changes missing coverage. Please review.

Project coverage is 57.77%. Comparing base (f49a95e) to head (7a0c5a4).

Files with missing lines	Patch %	Lines
crates/builder/src/task.rs	0.00%	22 Missing ⚠️
crates/pool/src/task.rs	0.00%	19 Missing ⚠️
bin/rundler/src/cli/mod.rs	0.00%	13 Missing ⚠️
crates/rpc/src/task.rs	0.00%	12 Missing ⚠️
crates/builder/src/bundle_proposer.rs	90.80%	8 Missing ⚠️
crates/pool/src/mempool/uo_pool.rs	83.72%	7 Missing ⚠️
bin/rundler/src/cli/node/mod.rs	0.00%	6 Missing ⚠️
bin/rundler/src/cli/rpc.rs	0.00%	6 Missing ⚠️
bin/rundler/src/cli/builder.rs	0.00%	1 Missing ⚠️
bin/rundler/src/cli/pool.rs	0.00%	1 Missing ⚠️

Additional details and impacted files

Files with missing lines	Coverage Δ
crates/pool/src/chain.rs	93.65% <ø> (ø)
crates/pool/src/mempool/mod.rs	100.00% <ø> (ø)
bin/rundler/src/cli/builder.rs	0.00% <0.00%> (ø)
bin/rundler/src/cli/pool.rs	0.00% <0.00%> (ø)
bin/rundler/src/cli/node/mod.rs	0.00% <0.00%> (ø)
bin/rundler/src/cli/rpc.rs	0.00% <0.00%> (ø)
crates/pool/src/mempool/uo_pool.rs	89.72% <83.72%> (-0.47%)	⬇️
crates/builder/src/bundle_proposer.rs	87.67% <90.80%> (-0.04%)	⬇️
crates/rpc/src/task.rs	0.00% <0.00%> (ø)
bin/rundler/src/cli/mod.rs	0.00% <0.00%> (ø)
... and 2 more

Flag	Coverage Δ
unit-tests	57.77% <54.76%> (+0.09%)	⬆️

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

Components	Coverage Δ
rundler binary	0.00% <0.00%> (ø)
builder	61.87% <72.47%> (+0.25%)	⬆️
dev	∅ <ø> (∅)
pool	64.31% <58.06%> (-0.14%)	⬇️
provider	19.79% <ø> (ø)
rpc	25.88% <0.00%> (+0.09%)	⬆️
sim	76.64% <ø> (ø)
tasks	∅ <ø> (∅)
types	67.51% <ø> (ø)
utils	29.38% <ø> (ø)