## Description
There are still some references to simapp in `x/bank` and `x/slashing`. This patch removes them. Somewhat related to forming tests also:
- Flags `LegacySubspace exported.Subspace` as ``optional:"true"`` since x/params is moving to deprecation
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## Description
ref: #8961
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Following up on [#9697](https://github.com/cosmos/cosmos-sdk/pull/9697#pullrequestreview-727295733), this PR is the first step for the #8961.
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## Description
Closes: #9800
The following is a breaking fix to #9800. In the non-breaking fix, the initialization logic was moved out of `InitializeAndSeal` but the API was preserved. I've now removed `InitializeAndSeal` and replaced it with just the `Seal` function, which may be called much more cleanly in `app.go`
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- [x] added a changelog entry to `CHANGELOG.md`
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- [x] updated the relevant documentation or specification
- [x] reviewed "Files changed" and left comments if necessary
- [ ] confirmed all CI checks have passed
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Matt Kocubinski
Julien Robert
Facundo Medica
MD Aleem
Aditya