feat: add log level config

[0xJuancito]

Add log level in a similar style to log4js

"ALL" > "LOG" > "DEBUG" > "INFO" > "WARN" > "ERROR" > "OFF"

I'm passing a config object with the logLevel instead of the env-config-component because it would require changing the external API to use Promises, leading to breaking changes. In the future, we could pass either this config | WKC config

[0xJuancito]

Having some build error on the CI: https://github.com/well-known-components/logger/runs/7034017036?check_suite_focus=true

Solved locally by updating the @microsoft/api-extractor dependency 🤔

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Update: solved here 8cb8acf

[menduz]

This is a critical code path and using the findIndex may not be the optimal choice, could we store those const as numbers in an object or enum and prevent the findIndex?

index = orderedLevels.findIndex((level) => level === functionLogLevel)

// is the same as 
const enum =  { "OFF": 0, "LOG": 1, "DEBUG": 2, "INFO": 4, "WARN": 8, "ERROR": 16, "ALL": 1 | 2 | 4 | 8 | 16 }
numericLevel = enum[key]

[0xJuancito]

Agree. Done. I had to interchange the values of OFF and ALL

const levelsEnum = { ALL: 0, LOG: 1, DEBUG: 2, INFO: 4, WARN: 8, ERROR: 16, OFF: 1 | 2 | 4 | 8 | 16 }