Enable noImplicitAny option

[castrodd]

Currently, noImplicitAny is set to false. In general, this setting should be turned on, but I know it is useful for codebases transitioning from non-typed JavaScript to TypeScript.

When I checked how much work was needed to set noImplicitAny to true, I found that there were only two errors:

ERROR in ./src/converters/fromRpcNullable.ts:13:13
TS7053: Element implicitly has an 'any' type because expression of type 'string' can't be used to index type '{}'.
  No index signature with a parameter of type 'string' was found on type '{}'.
    11 |     if (nullableMapping && Object.keys(nullableMapping).length > 0) {
    12 |         for (const key in nullableMapping) {
  > 13 |             converted[key] = nullableMapping[key].value || '';
       |             ^^^^^^^^^^^^^^
    14 |         }
    15 |     } else if (originalMapping && Object.keys(originalMapping).length > 0) {
    16 |         converted = originalMapping;

ERROR in ./src/converters/toCamelCase.ts:12:13
TS7053: Element implicitly has an 'any' type because expression of type 'string' can't be used to index type '{}'.
  No index signature with a parameter of type 'string' was found on type '{}'.
    10 |         const result = {};
    11 |         for (const [key, value] of Object.entries(data)) {
  > 12 |             result[toCamelCaseKey(key)] = toCamelCaseValue(value);
       |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^
    13 |         }
    14 |         return result;
    15 |     }

This PR addresses these two errors and sets noImplicitAny to true (this is the default when strict is true).