📝 Add docstrings to feat/evault-provisioning-via-phone (#189)

Docstrings generation was requested by @coodos.

* #188 (comment)

The following files were modified:

* `infrastructure/eid-wallet/src/lib/utils/capitalize.ts`
* `infrastructure/evault-provisioner/src/utils/hmac.ts`

Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com>

Author: coderabbitai[bot]

infrastructure/eid-wallet/src/lib/utils/capitalize.ts

@@ -1,3 +1,9 @@
+/**
+ * Returns a new string with the first letter of each word in uppercase and the remaining letters in lowercase.
+ *
+ * @param str - The input string to capitalize.
+ * @returns The capitalized string.
+ */
 export function capitalize(str: string) {
     return str
         .toLowerCase()

infrastructure/evault-provisioner/src/utils/hmac.ts

@@ -1,11 +1,26 @@
 import { createHmac } from "crypto";
 
+/**
+ * Generates an HMAC SHA-256 signature for a JSON-serializable object using the provided secret key.
+ *
+ * @param body - The object to be signed.
+ * @param secret - The secret key used for HMAC generation.
+ * @returns The hexadecimal string representation of the HMAC signature.
+ */
 export function createHmacSignature(body: Record<string, any>, secret: string) {
     return createHmac("sha256", secret)
         .update(JSON.stringify(body))
         .digest("hex");
 }
 
+/**
+ * Verifies that a provided HMAC signature matches the expected signature for a given object and secret key.
+ *
+ * @param body - The object whose signature is to be verified.
+ * @param signature - The HMAC signature to compare against.
+ * @param secret - The secret key used to generate the expected signature.
+ * @returns `true` if the signature is valid; otherwise, `false`.
+ */
 export function verifyHmacSignature(
     body: Record<string, any>,
     signature: string,