Add Conda environment setup and dependency installation script

[bisqq]

Description

This script sets up the development environment by:

• Creating a Conda environment
• Installing all required dependencies

Enables contributors to quickly replicate a working environment.

Tests

Checklist:

• [x] I have read the contribution guidelines.
• [x] I have updated the documentation, if applicable.
• [x] I have ensured that the change is tested somewhere in the testsuite (adding new test cases if necessary).
• [x] My code follows the prevailing code style of this project. If I haven't already run clang-format v17 before submitting, I definitely will look at the CI test that runs clang-format and fix anything that it highlights as being nonconforming.

[lgritz]

Maybe put this script in the src/build-scripts directory?

[lgritz]

I think this could be pretty useful for people. Can you add some documentation to "INSTALL.md" explaining how to use it?

[lgritz]

I think that to wrap up this PR, we're primarily waiting for some modification to INSTALL.md instructions to explain briefly how and when to use it.