feat: display stats about total & active TUs on proposals

This patch brings in two new features:
- when viewing proposal listings, there is a new Statistics section,
  containing the total and active number of Trusted Users found in the
  database.
- when viewing a proposal directly, the number of active trusted users
  assigned when the proposal was added is now displayed in the details
  section.

Closes #323

Signed-off-by: Kevin Morris <kevr@0cost.org>
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