[feature + performance] add JSON logging format (#4355)

# Description

Adds JSON logging as an optional alternative log output format. In the process this moves our log formatting itself into a separate subpkg to make it more easily modular, and improves caller name getting with some calling function name caching.

## Checklist

- [x] I/we have read the [GoToSocial contribution guidelines](https://codeberg.org/superseriousbusiness/gotosocial/src/branch/main/CONTRIBUTING.md).
- [x] I/we have discussed the proposed changes already, either in an issue on the repository, or in the Matrix chat.
- [x] I/we have not leveraged AI to create the proposed changes.
- [x] I/we have performed a self-review of added code.
- [x] I/we have written code that is legible and maintainable by others.
- [x] I/we have commented the added code, particularly in hard-to-understand areas.
- [x] I/we have made any necessary changes to documentation.
- [ ] I/we have added tests that cover new code.
- [x] I/we have run tests and they pass locally with the changes.
- [x] I/we have run `go fmt ./...` and `golangci-lint run`.

Reviewed-on: https://codeberg.org/superseriousbusiness/gotosocial/pulls/4355
Co-authored-by: kim <grufwub@gmail.com>
Co-committed-by: kim <grufwub@gmail.com>

scripts/test.sh

@@ -7,7 +7,7 @@ set -e
 # "./..." = all tests
 
 # run tests with sqlite in-memory database
-GTS_DB_TYPE="sqlite" GTS_DB_ADDRESS=":memory:" go test -tags "netgo osusergo static_build kvformat" -count 1 ./...
+GTS_DB_TYPE="sqlite" GTS_DB_ADDRESS=":memory:" go test -tags "netgo osusergo static_build" -count 1 ./...
 
 # run tests with postgres database at either GTS_DB_ADDRESS or default localhost
-GTS_DB_TYPE="postgres" GTS_DB_ADDRESS="${GTS_DB_ADDRESS:-localhost}" go test -tags "netgo osusergo static_build kvformat" -count 1 -p 1 ./...
+GTS_DB_TYPE="postgres" GTS_DB_ADDRESS="${GTS_DB_ADDRESS:-localhost}" go test -tags "netgo osusergo static_build" -count 1 -p 1 ./...