Read metadata of installed packages lazily#1273
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Branched from #1271
Progress towards #1212
Closes #1265
Uses same approach as file contents in #1271 to read
NAMESPACEandDESCRIPTIONlazily. This way the only thing that we need to initialise a library of installed packages are the folder names and the presence of a DESCRIPTION file. Unlike workspace packages, we don't read thePackagefield and just assume that a folder with a description file is indeed a package named after the folder name.This avoids I/O and parsing costs for installed packages that are not imported or mentioned in the workspace files.