Implementation of built-in types generation (#7)

* add email generation and update documentation
* add tests for derived types in XML schema generator
* add hexBinary generation and corresponding tests
* refactor XML value generation to use TypeConstraints for improved clarity and maintainability
* refactor value generation to extract type constraints into a separate function for improved clarity and maintainability
* add tests for derived types and implement generation for byte, short, int, and integer types
* bump version to 0.5.0

Author: lexakimov

README.md

@@ -241,6 +241,7 @@ In the `value_override` sections, you can specify either a string value or speci
 | `ogrn_fl`                          | Primary State Registration Number (Physical Person)                                                        |
 | `kpp`                              | Reason Code for Registration                                                                               |
 | `snils_formatted`                  | SNILS (Personal Insurance Account Number) in the format `123-456-789 90`                                   |
+| `email`                            | Random email address                                                                                       |
 
 **Configuration Examples:**
 

README_RU.md

@@ -241,6 +241,7 @@ specific:
 | `ogrn_fl`                          | ОГРН физического лица                                                                                      |
 | `kpp`                              | КПП                                                                                                        |
 | `snils_formatted`                  | СНИЛС в формате `123-456-789 90`                                                                           |
+| `email`                            | Случайный адрес электронной почты                                                                          |
 
 **Примеры конфигураций:**
 

config_fns.yml

@@ -32,6 +32,7 @@ global:
     "^ОГРН$":    "{{ ogrn_fl }}"
     "КПП":       "{{ kpp }}"
     "СНИЛС":     "{{ snils_formatted }}"
+    "ЭлПочта":   "{{ email }}"
 
 specific:
   ".*":

setup.py

@@ -2,7 +2,7 @@
 
 setup(
     name='xmlgenerator',
-    version='0.4.0',
+    version='0.5.0',
     packages=find_packages(exclude=("tests", "tests.*")),
     entry_points={
         'console_scripts': [