State: Add serde support for StateMap, StateValue.. etc structures

[bkolad]

Description

This PR adds serde support for StateXX structures so they can be serialized recursively with different codecs than borsh

Testing

CI passes.

Docs

No doc changes.

[codecov]

Codecov Report

Merging #805 (de4625b) into nightly (1adbfc9) will decrease coverage by 0.3%.
The diff coverage is 20.3%.

Files Changed	Coverage Δ
...e-system/sov-state/src/containers/accessory_map.rs	53.8% <0.0%> (-4.5%)	⬇️
...system/sov-state/src/containers/accessory_value.rs	40.8% <0.0%> (-12.7%)	⬇️
module-system/sov-state/src/containers/value.rs	69.7% <0.0%> (-11.4%)	⬇️
module-system/sov-state/src/containers/vec.rs	90.8% <12.5%> (-2.9%)	⬇️
...e-system/sov-state/src/containers/accessory_vec.rs	86.6% <22.2%> (-2.6%)	⬇️
module-system/sov-state/src/containers/map.rs	93.4% <42.8%> (-5.2%)	⬇️
module-system/sov-state/src/lib.rs	76.3% <42.8%> (-8.1%)	⬇️
module-system/sov-state/src/utils.rs	77.4% <42.8%> (-10.6%)	⬇️

... and 3 files with indirect coverage changes

[preston-evans98]

LGTM! Go ahead and merge and then I'll handle merging with #804