PurlDB: purl2sym Data collection Batch4

[DennisClark]

Here we add purl2sym support for a list of PURLs listed below.

1. Add support in FetchCode and PurlDB
2. Test of end-to-end support in the PurlDB

• pkg:generic/udhcp
• pkg:github/hewlettpackard/wireless-tools
• pkg:conan/expat
• pkg:conan/libxml2
• pkg:conan/dbus
• pkg:conan/ncurses
• pkg:conan/pcre
• pkg:conan/popt
• pkg:github/shadow-maint/shadow
• pkg:conan/libsystemd

[keshav-space]

Completed in:

• purl2sym: Add metadata support for packages hosted on GitHub fetchcode#112
• Use authenticated requests for GitHub REST API calls fetchcode#115
• purl2sym: Support indexing of Batch3, Batch4 and Batch5 packages #360
• Support conan package indexing #289

The simple way to test this is to follow the below steps after installing PurlDB (https://github.com/nexB/purldb?tab=readme-ov-file#installation):

1. Go to /api/collect/ add PURL for indexing. ex: /api/collect/?purl=pkg:generic/udhcp@0.9.7&addon_pipelines=collect_symbols_ctags
2. Once the indexing has completed go to /api/resources/and filter out resource based on PURL to see the symbols for each resource in extra_data field. ex: /api/resources/?purl=pkg:generic/udhcp@0.9.7

Tip

Follow this tutorial to index the symbols and strings literals for a PURL/Package using various different addon pipelines. https://aboutcode.readthedocs.io/projects/PURLdb/en/latest/how-to-guides/tutorial_symbol_and_string_collection.html