feat(baseapp): expose `Mempool` (backport #17954) · cosmos/cosmos-sdk@e88539f

: # github.com/cosmos/cosmos-sdk/baseapp

syntax error: non-declaration statement outside function body

syntax error: non-declaration statement outside function body

invalid character U+0023 '#' (typecheck)

expected declaration, found '<<' (typecheck)

illegal character U+0023 '#' (typecheck)

expected declaration, found 'if' (typecheck)

expected declaration, found ctx (typecheck)

expected declaration, found anteCtx (typecheck)

expected declaration, found 'for' (typecheck)

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