Add string_field presets: hashes, barcodes, dates

Author: rich-iannone

docs/user-guide/test-data-generation.qmd

@@ -219,13 +219,25 @@ The `preset=` parameter in `string_field()` supports many data types:
 **Identifiers:**
 
 - `uuid4`: UUID version 4
+- `md5`: MD5 hash (32 hex characters)
+- `sha1`: SHA-1 hash (40 hex characters)
+- `sha256`: SHA-256 hash (64 hex characters)
 - `ssn`: Social Security Number (country-specific format)
 - `license_plate`: vehicle license plate (location-aware for CA, US, DE, AU, GB)
 
+**Barcodes:**
+
+- `ean8`: EAN-8 barcode with valid check digit
+- `ean13`: EAN-13 barcode with valid check digit
+
 **Date/Time:**
 
 - `date_this_year`: a date within the current year
 - `date_this_decade`: a date within the current decade
+- `date_between`: a random date between 2000 and 2025
+- `date_range`: two dates joined with an en-dash (e.g., `"2012-05-12 – 2015-11-22"`)
+- `future_date`: a date up to 1 year in the future
+- `past_date`: a date up to 10 years in the past
 - `time`: a time value
 
 **Text:**

pointblank/field.py

@@ -863,9 +863,17 @@ def string_field(
 
     **Financial:** `"credit_card_number"`, `"iban"`, `"currency_code"`
 
-    **Identifiers:** `"uuid4"`, `"ssn"` (social security number), `"license_plate"`
+    **Identifiers:** `"uuid4"`, `"md5"` (MD5 hash, 32 hex chars), `"sha1"` (SHA-1 hash,
+    40 hex chars), `"sha256"` (SHA-256 hash, 64 hex chars), `"ssn"` (social security number),
+    `"license_plate"`
 
-    **Date/Time (as strings):** `"date_this_year"`, `"date_this_decade"`, `"time"`
+    **Barcodes:** `"ean8"` (EAN-8 barcode with valid check digit), `"ean13"` (EAN-13 barcode
+    with valid check digit)
+
+    **Date/Time (as strings):** `"date_this_year"`, `"date_this_decade"`, `"date_between"`
+    (random date between 2000–2025), `"date_range"` (two dates joined with an en-dash, e.g.,
+    `"2012-05-12 – 2015-11-22"`), `"future_date"` (up to 1 year ahead), `"past_date"`
+    (up to 10 years back), `"time"`
 
     **Miscellaneous:** `"color_name"`, `"file_name"`, `"file_extension"`, `"mime_type"`