feat(replay/accountsdb) basic account fetching + unrooted store

[Sobeston]

Will likely follow this up with some restructuring of replay + async account fetching

[codecov]

Codecov Report

❌ Patch coverage is 0% with 102 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
v2/services/replay.zig	0.00%	95 Missing ⚠️
v2/init/main.zig	0.00%	2 Missing ⚠️
v2/lib/accounts_db/rooted.zig	0.00%	2 Missing ⚠️
v2/services/exec.zig	0.00%	2 Missing ⚠️
v2/lib/accounts_db/pool.zig	0.00%	1 Missing ⚠️

❌ Your patch check has failed because the patch coverage (0.00%) is below the target coverage (85.00%). You can increase the patch coverage or adjust the target coverage.

Files with missing lines	Coverage Δ
v2/lib/fio/writer.zig	0.00% <ø> (ø)
v2/lib/replay.zig	0.00% <ø> (ø)
v2/lib/accounts_db/pool.zig	0.00% <0.00%> (ø)
v2/init/main.zig	0.00% <0.00%> (ø)
v2/lib/accounts_db/rooted.zig	0.00% <0.00%> (ø)
v2/services/exec.zig	0.00% <0.00%> (ø)
v2/services/replay.zig	25.30% <0.00%> (-4.85%)	⬇️

... and 2 files with indirect coverage changes

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