[#43,#126] Tweak log messages, code comments, and json formatting.

[irods/irods#8144] Remove no-longer-needed usage of IRODS_LINUX_DISTR…

[#242] Create custom keycloak image for testing

[#391] Add missing return to set_log_level(...)

[#390] Add CMake options for enabling Undefined Behavior Sanitizer

[#375] Make strict introspection endpoint aud check opt-in

[#375] Handle missing aud claim in access token

[#389] Fix KeyVal memory leak

[#382] Add Ubuntu builds to github action

[#43] fix typo

[#346] Bump version to 0.5.0.

[#359] Rename realm_secret to access_token_secret

[#107] Validate OpenID ID Tokens in client mode

[#365] Leave space in buffer for null-terminating byte when using std…

[#270] Validate OAuth Token Introspection response

[#343] Validate JWT Access Tokens locally

[#356] Improve error handling in load_oidc_configuration()

[#244] Provide clear message on OpenID connection error

[#243] Improve documentation of tls_certificates_directory

[#269] Collapse version information to single point of control.

[#337] Print clear error message when config file path is invalid.

[#338] OIDC: Confirm mapped iRODS username exists before returning to…

[#293] Provide user mapping through plugins

[#335] Avoid infinite loop when listening socket is already bound.

[#333] Fix handling of SIGPIPE signal for iRODS connections.

[#329] Bump version to 0.4.0.

[#328] Rename config option to better express intent.

[#323] Document stat operation for /zones endpoint.

[#325] Do not redefine log.

[#272] Update dependencies to iRODS 4.3.2 for GenQuery2.