Add RollupTemplate trait and reimplemnt demo-rollup.

[bkolad]

Description

This PR introduces the RollupTemplate trait. This implementer of this trait has to define all the dependencies needed to create a new rollup and getscreate_new_rollup method for "free" .

Changes:

1. MockDa & CelestiaDa rollups in demo-rollup are re-implemented in terms of RollupTemplate.
2. App structure removed form demo-rollup/stf/

sov-rollup-starter will be updated in the next PR.

Testing

CI passes.

Docs

Relevant docs added.

[codecov]

Codecov Report

Merging #1055 (92685ab) into nightly (421e264) will increase coverage by 0.1%.
The diff coverage is 85.3%.

Files	Coverage Δ
full-node/sov-stf-runner/src/lib.rs	100.0% <ø> (ø)
full-node/sov-stf-runner/src/runner.rs	75.0% <100.0%> (ø)
...tions/integration-tests/src/chain_state/helpers.rs	100.0% <ø> (ø)
...tations/integration-tests/src/chain_state/tests.rs	96.9% <100.0%> (-0.1%)	⬇️
...ystem/sov-modules-stf-template/src/app_template.rs	89.0% <100.0%> (ø)
module-system/sov-modules-stf-template/src/lib.rs	89.5% <ø> (ø)
module-system/sov-state/src/storage.rs	94.3% <ø> (ø)
rollup-interface/src/state_machine/stf.rs	85.7% <ø> (ø)
rollup-interface/src/state_machine/zk/mod.rs	100.0% <ø> (ø)
sov-rollup-starter/src/rollup.rs	91.2% <ø> (ø)
... and 5 more

... and 1 file with indirect coverage changes