feat(sdk): start using sdk in integration tests

[smartcontracts]

Description
First PR in a series of PRs to start integrating the SDK into the integration tests. It's too much work to do this all in one PR. Includes a few minor bugfixes to the SDK.

[changeset-bot]

🦋 Changeset detected

Latest commit: edb2184

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@eth-optimism/integration-tests	Patch

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[smartcontracts]

I removed this test because we should just handle this as part of 1.0. No need to have a dead test here for behavior we haven't specified.

[smartcontracts]

Instead of making this a second test, we can just assert this inside of the above test which does exactly the same L1 to L2 message. Slightly speeds up the integration tests, which will add up as we start consolidating more tests.

[smartcontracts]

Note to self: maybe worth having sendMessageToL1 and sendMessageToL2 functions to avoid needing the direction parameter

[smartcontracts]

I'm really happy with how simple this is

[codecov-commenter]

Codecov Report

Merging #2122 (31f0b4f) into develop (fc0b313) will decrease coverage by 0.99%.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##           develop    #2122      +/-   ##
===========================================
- Coverage    73.66%   72.66%   -1.00%     
===========================================
  Files           67       84      +17     
  Lines         2187     2883     +696     
  Branches       327      481     +154     
===========================================
+ Hits          1611     2095     +484     
- Misses         576      788     +212     

Flag	Coverage Δ
batch-submitter	62.63% <ø> (ø)
contracts	90.48% <ø> (ø)
core-utils	59.94% <ø> (ø)
data-transport-layer	37.74% <ø> (ø)
message-relayer	70.86% <ø> (?)
sdk	69.24% <100.00%> (?)

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Impacted Files	Coverage Δ
packages/sdk/src/utils/contracts.ts	100.00% <ø> (ø)
packages/sdk/src/utils/merkle-utils.ts	27.27% <100.00%> (ø)
packages/sdk/src/interfaces/types.ts	100.00% <0.00%> (ø)
packages/sdk/src/interfaces/index.ts	100.00% <0.00%> (ø)
packages/sdk/src/utils/coercion.ts	90.00% <0.00%> (ø)
packages/sdk/hardhat.config.ts	100.00% <0.00%> (ø)
packages/message-relayer/hardhat.config.ts	100.00% <0.00%> (ø)
packages/sdk/src/cross-chain-messenger.ts	69.02% <0.00%> (ø)
... and 9 more

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