feat(useSession): support custom session id generator

[maou-shonen]

Sometimes it may be necessary to customize the session ID.
for example, using something like crypto.randomBytes(20).toString('base64url').
having a method available in the session configuration would be convenient.

[codecov]

Codecov Report

Merging #390 (9fcc3e5) into main (e176ecc) will decrease coverage by 0.02%.
The diff coverage is 50.00%.

❗ Current head 9fcc3e5 differs from pull request most recent head 6b54bcf. Consider uploading reports for the commit 6b54bcf to get more accurate results

@@            Coverage Diff             @@
##             main     #390      +/-   ##
==========================================
- Coverage   76.19%   76.17%   -0.02%     
==========================================
  Files          26       26              
  Lines        2436     2439       +3     
  Branches      339      339              
==========================================
+ Hits         1856     1858       +2     
- Misses        580      581       +1     

Impacted Files	Coverage Δ
src/utils/session.ts	22.27% <50.00%> (+0.61%)	⬆️

[maou-shonen]

Do I need to create a session.test.ts?
Should I open another PR?

[Atinux]

What would be the use case to customize the ID generation?

[pi0]

Thanks!

[pi0]

What would be the use case to customize the ID generation?

I have no usecase but makes sense to make id generation customizable (shorter, compatible with backend, more secure, crypto incompatibility, etc could be some reasons)

[maou-shonen]

What would be the use case to customize the ID generation?

Obviously, I'm replying late,😅
One of my real-world use cases is that I can set the session ID to be the same as the ID from external login (usually OAuth2),
This way, I don't need to use two DB fields or session.data.id to associate them.