feat: Case-insensitive username and email fields

[spencewenski]

Problem

It's common for typos to occur when entering usernames and emails that result in random incorrect capitalization. Additionally, it's both a security vulnerability and a usability issue if multiple users can have the same username/email just with different capitalization.

Solution

• Add a case-insensitive collation (we only officially support this on Postgres
• Assign the Username and Email columns of the User table to use the case-insensitive collation.

Closes #479

[codecov]

Codecov Report

Attention: Patch coverage is 57.35294% with 58 lines in your changes missing coverage. Please review.

Project coverage is 42.64%. Comparing base (81f6b13) to head (383c4c3).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/migration/collation/mod.rs	49.29%	36 Missing ⚠️
...20241022_072216_case_insensitive_username_email.rs	71.92%	16 Missing ⚠️
...ion/m20241022_065427_case_insensitive_collation.rs	0.00%	6 Missing ⚠️

Files with missing lines	Coverage Δ
.../m20240723_201404_add_update_timestamp_function.rs	0.00% <ø> (ø)
src/migration/timestamp/mod.rs	56.41% <ø> (ø)
src/migration/user/mod.rs	100.00% <100.00%> (ø)
src/service/worker/sidekiq/builder.rs	45.50% <ø> (ø)
...ion/m20241022_065427_case_insensitive_collation.rs	0.00% <0.00%> (ø)
...20241022_072216_case_insensitive_username_email.rs	71.92% <71.92%> (ø)
src/migration/collation/mod.rs	49.29% <49.29%> (ø)

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