print of teal_data should include datanames (and also possibly join_keys)

[pawelru]

Feature description

teal might throw that data object (of teal_data class) is missing datanames attribute however this is not very straightforward to check its content. One needs to know teal.data package API to get to know this. I think we can make it simpler and print this when printing the whole object so that the knowledge of package API is no longer needed.

Currently, only validated attribute is included.

Function to modify:

teal.data/R/teal_data-show.R

Lines 13 to 20 in 870e7a4

	setMethod("show", signature = "teal_data", function(object) {
	if (object@verified) {
	cat("\u2705\ufe0e", "verified teal_data object\n")
	} else {
	cat("\u2716", "unverified teal_data object\n")
	}
	rlang::env_print(object@env)
	})

Code of Conduct

• I agree to follow this project's Code of Conduct.

Contribution Guidelines

• I agree to follow this project's Contribution Guidelines.

Security Policy

• I agree to follow this project's Security Policy.