Add `ctf::src::Ctf1MetadataStreamParser` class (TSDL)

Add `ctf::src::Ctf1MetadataStreamParser` class (TSDL)

This patch adds the `ctf::src::Ctf1MetadataStreamParser` class which is
a concrete TSDL metadata stream parser inheriting
`ctf::src::MetadataStreamParser`.

parseSection() requires one or more complete root blocks of TSDL
contents.

`ctf::src::Ctf1MetadataStreamParser` also implements the static
ctf::src::Ctf1MetadataStreamParser::parse() which considers a whole
metadata stream. While this static method currently doesn't add anything
to creating a parser and calling parseSection() once, it could
eventually contain more validation knowing that the metadata stream was
completely parsed.

Signed-off-by: Philippe Proulx <eeppeliteloop@gmail.com>
Signed-off-by: Francis Deslauriers <francis.deslauriers@efficios.com>
Change-Id: I55e0f2f05d64a0acc5949029e315aeefae424dda
Reviewed-on: https://review.lttng.org/c/babeltrace/+/8000
Reviewed-by: Philippe Proulx <eeppeliteloop@gmail.com>
Reviewed-on: https://review.lttng.org/c/babeltrace/+/12734