Add prettier configuration and a format check step in ci

[Johnsource-hub]

#closes
#545
Summary of Changes
Created Prettier Configuration files:

.prettierrc.json: Matching existing codebase styles (single quotes, semicolons enabled, 2-space tab width, es5 trailing commas, print width of 100, and lf line endings).
.prettierignore: Excluding standard built outputs and databases (node_modules/, dist/, *.db, etc.).
Added Dev Dependencies:

Installed prettier and eslint-config-prettier to ensure formatting works seamlessly and ESLint rules do not conflict.
Installed eslint@8, @typescript-eslint/parser@7, and @typescript-eslint/eslint-plugin@7 to solve the missing local dependencies that previously prevented ESLint from running locally.
Resolved ESLint Parser Scope:

Created tsconfig.eslint.json extending tsconfig.json to include tests/ in the compilation scope for ESLint, ensuring typescript-eslint doesn't fail on testing files.
Configured .eslintrc.cjs to use tsconfig.eslint.json and extend prettier to prevent stylistic conflicts.
Added NPM Scripts & CI Workflow Step:

Added format:check (prettier --check .) and format (prettier --write .) scripts to package.json.
Added a Check formatting step (npm run format:check) in .github/workflows/ci.yml to fail the build on pull requests or commits with unformatted files.
Reformatted Entire Codebase:

Formatted the repository repo-wide using npm run format so that the formatting baseline is clean.
Ran npm run format:check and verified that formatting checks pass cleanly with exit code 0.