Lazy load Brave Crypto Wallets (uplift to 1.10.x)

[brave-builds]

Uplift of #5513

Why is this being requested for uplift?

This is being uplifted because of community complaints with backwards network traffic which occurs because of accidental installs.

This work makes it more explicit and also lazy loads things until an explicit action is taken.

It will also significantly decrease the Infura usage. We are currently above the highest package so would otherwise need to move to a custom plan.

If approved, please ensure that before merging:

• You have checked CI and the builds, lint, and tests all pass or are not related to your PR.
• You have tested your change on Nightly.
• The PR milestones match the branch they are landing to.

After you merge:

• The associated issue milestone is set to the smallest version that the changes is landed on.

[bbondy]

CI looks good. Only failure is an unrelated Rewards test fail:

BraveRewardsBrowserTest.NotVerifiedWallet

[srirambv]

Uplift to 1.10.x approved after deliberating with @brave/uplift-approvers. CI Failure relating to rewards which should not block the uplift.