enable JSON formatted logs if EDG_LOG_FORMAT=json

[thomasten]

Enable JSON formatted logging for ego run and ego marblerun in case the EDG_LOG_FORMAT env variable is set to json:

$ ego marblerun hello
2024/11/21 15:26:21 INFO EGo version=1.6.0 git_commit=943be7f7c0aa68ecd40bba3d70f730c8c7b944d0
[erthost] loading enclave ...
[erthost] entering enclave ...
[PreMain] 2024/11/21 15:26:22 starting PreMain
[PreMain] 2024/11/21 15:26:22 fetching env variables

$ EDG_LOG_FORMAT=json ego marblerun hello
{"time":"2024-11-21T15:26:45.767590536Z","level":"INFO","msg":"EGo","version":"1.6.0","git_commit":"943be7f7c0aa68ecd40bba3d70f730c8c7b944d0"}
{"time":"2024-11-21T15:26:45.770137068Z","level":"INFO","msg":"[erthost] loading enclave ..."}
{"time":"2024-11-21T15:26:47.207473447Z","level":"INFO","msg":"[erthost] entering enclave ..."}
{"level":"info","ts":1732202807.225447,"caller":"premain/premain.go:152","msg":"[PreMain] starting PreMain"}
{"level":"info","ts":1732202807.226447,"caller":"premain/premain.go:155","msg":"[PreMain] fetching env variables"}

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