feat: add missing schema to openapi docs

[lutr0]

What ❔

Same PR as matter-labs#311
Add type to all empty schemas, e.g.:
just find all instances of:

"schema": {}

That's essentially saying: the type is an object, but in reality you want strings here (for example for the 'address' parameter, you want a string input for the address, not an object

"schema": {
  "type": "string"
}

Why ❔

Some parameters are missing schemas. This affects automation from partners e.g. MeritCircle

Checklist

• PR title corresponds to the body of PR (we generate changelog entries from PRs).
• Tests for the changes have been added / updated.
• Documentation comments have been added / updated.

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API E2E Test Results

207 tests   207 ✅  21s ⏱️
 14 suites    0 💤
  1 files      0 ❌

Results for commit 53d2060.

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Unit Test Results

    4 files    263 suites   11m 33s ⏱️
2 087 tests 2 086 ✅ 1 💤 0 ❌
2 296 runs  2 295 ✅ 1 💤 0 ❌

Results for commit 53d2060.

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