[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>

1 files changed, 1 insertions, 2 deletions

diff --git a/scripts/build.sh b/scripts/build.sh
index b22861240..c6931e09d 100755
--- a/scripts/build.sh
+++ b/scripts/build.sh
@@ -6,7 +6,7 @@ set -e
 log_exec() { echo "$ ${*}"; "$@"; }
 
 # Grab environment variables and set defaults + requirements.
-GO_BUILDTAGS="${GO_BUILDTAGS-} netgo osusergo static_build kvformat timetzdata"
+GO_BUILDTAGS="${GO_BUILDTAGS-} netgo osusergo static_build timetzdata"
 GO_LDFLAGS="${GO_LDFLAGS-} -s -w -extldflags '-static' -X 'main.Version=${VERSION:-$(git describe --tags --abbrev=0)}'"
 GO_GCFLAGS=${GO_GCFLAGS-}
 
@@ -15,7 +15,6 @@ GO_GCFLAGS=${GO_GCFLAGS-}
     GO_BUILDTAGS="${GO_BUILDTAGS} debugenv"
 
 # Available Go build tags, with explanation, followed by benefits of enabling it:
-# - kvformat:       enables prettier output of log fields                          (slightly better performance)
 # - timetzdata:     embed timezone database inside binary                          (allow setting local time inside Docker containers, at cost of 450KB)
 # - nootel:         disables compiling-in otel support                             (reduced binary size)
 # - noerrcaller:    disables caller function prefix in errors                      (slightly better performance, at cost of err readability)