fix(wasm): add missed UpdateContractStatusProposal types

[whylee259]

Description

Added missed UpdateContractStatusProposal relevant types

• add proposal type string
• register proposal codec

related to https://github.com/line/lbm/pull/1324#discussion_r624975376

closes: #XXXX

---

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• Targeted PR against correct branch (see CONTRIBUTING.md)
• Linked to Github issue with discussion and accepted design OR link to spec that describes this work.
• Code follows the module structure standards.
• Wrote unit and integration tests
• Updated relevant documentation (docs/) or specification (x/<module>/spec/)
• Added relevant godoc comments.
• Added a relevant changelog entry to the Unreleased section in CHANGELOG.md
• Re-reviewed Files changed in the Github PR explorer
• Review Codecov Report in the comment section below once CI passes

[codecov]

Codecov Report

Merging #162 (dcd7d27) into v2/develop (1f739c5) will decrease coverage by 1.84%.
The diff coverage is 68.87%.

@@              Coverage Diff               @@
##           v2/develop     #162      +/-   ##
==============================================
- Coverage       54.99%   53.15%   -1.85%     
==============================================
  Files             812      704     -108     
  Lines           51487    47263    -4224     
==============================================
- Hits            28317    25124    -3193     
+ Misses          20211    19579     -632     
+ Partials         2959     2560     -399     

Impacted Files	Coverage Δ
client/grpc/tmservice/query.pb.gw.go	30.06% <ø> (ø)
client/keys/root.go	100.00% <ø> (ø)
client/keys/utils.go	44.11% <ø> (+5.22%)	⬆️
crypto/armor.go	85.89% <ø> (ø)
crypto/keys/ed25519/ed25519.go	67.34% <ø> (ø)
crypto/keys/multisig/codec.go	100.00% <ø> (ø)
crypto/keys/secp256k1/secp256k1.go	86.79% <ø> (ø)
simapp/test_helpers.go	8.41% <0.00%> (+7.91%)	⬆️
types/address.go	65.71% <ø> (ø)
types/config.go	84.61% <ø> (ø)
... and 84 more