Add filters to investments table

hypha/public/partner/tables.py

...lic/partner/templates/partner/base_investments_table.html

...r/templates/partner/includes/table_filter_and_search.html

hypha/public/partner/views.py

hypha/static_src/src/javascript/public/investment-filters.js

hypha/static_src/src/sass/public/abstracts/_variables.scss

...a/static_src/src/sass/public/components/_actions-bar.scss

hypha/static_src/src/sass/public/components/_button.scss

hypha/static_src/src/sass/public/components/_filters.scss

hypha/static_src/src/sass/public/components/_form.scss

hypha/static_src/src/sass/public/components/_input.scss

hypha/static_src/src/sass/public/main.scss