DOC: README - Kerberos Dependencies on Linux (#211)

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> GitHub Issue: #204

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### Summary   
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This pull request updates installation instructions and error messaging
to improve the setup experience for Linux users. The most important
changes include expanding the list of required packages in the
documentation for various Linux distributions and clarifying error
messages to direct users to the documentation for troubleshooting.

**Documentation improvements:**

* Expanded the list of required system packages in the `README.md` for
Alpine, Debian/Ubuntu, RHEL/CentOS/Fedora, and added instructions for
SUSE/openSUSE to ensure all necessary dependencies are installed before
running `pip install mssql-python`.

**Error handling improvements:**

* Updated the error message in `ddbc_bindings.cpp` to direct Linux users
to the documentation for dependency installation, instead of referencing
only the `libltdl7` package.

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Author: bewithgaurav

README.md

@@ -24,13 +24,16 @@ pip install mssql-python
 **Linux:** mssql-python can be installed with [pip](http://pypi.python.org/pypi/pip)
 ```bash
 # For Alpine
-apk add libtool krb5-libs
+apk add libtool krb5-libs krb5-dev
 
-# For Debian/Ubuntu
-apt-get install -y libltdl7
+# For Debian/Ubuntu  
+apt-get install -y libltdl7 libkrb5-3 libgssapi-krb5-2
 
 # For RHEL
-dnf install -y libtool-ltdl
+dnf install -y libtool-ltdl krb5-libs
+
+# For SUSE
+zypper install -y libltdl7 libkrb5-3 libgssapi-krb5-2
 
 pip install mssql-python
 ```

mssql_python/pybind/ddbc_bindings.cpp

@@ -725,11 +725,7 @@ DriverHandle LoadDriverOrThrowException() {
     DriverHandle handle = LoadDriverLibrary(driverPath.string());
     if (!handle) {
         LOG("Failed to load driver: {}", GetLastErrorMessage());
-        // If this happens in linux, suggest installing libltdl7
-        #ifdef __linux__
-            ThrowStdException("Failed to load ODBC driver. If you are on Linux, please install libltdl7 package.");
-        #endif
-        ThrowStdException("Failed to load ODBC driver. Please check installation.");
+        ThrowStdException("Failed to load the driver. Please read the documentation (https://github.com/microsoft/mssql-python#installation) to install the required dependencies.");
     }
     LOG("Driver library successfully loaded.");