Tasit-Action config file errors handling and path

[marcelomorgado]

Improve config file errors and warnings on these cases:

1. Config file not found
Throw error but keep an option open for the user to use the default as simply as possible.

2. Config w/ missing parts (e.g. jsonrpc provider without connections params)
Throw error and log exactly what is missing and suggest defaults in the log statements. The more lines we have const { bla } = blaBla followed by

if (!bla) {
  console.log("bla is needed to do foo because bar, but it's missing")
}

the better.

3. Error on parsing config file
Throwing and error and logging as best we can in which step the parsing failed. The more lines we have like this, the better:

try {
  jsonObject = JSON.parse(jsonString)
} catch (error) {
  if (error.message === "something") // or more likely, whether it contains a word
    console.log("This is why it failed")
  }
}

Related to: #87 (comment)

[marcelomorgado]

4. Rename folder name from config to .confg