allow to display the output in markdown

[jdrouet]

especially for diff and check

[jdrouet]

We actually get the following

[SUCCESS] binary-size{build.target="x86_64-unknown-linux-gnu", platform.os="linux", platform.arch="x86_64", unit="byte"} 3.71 MiB => 3.71 MiB
[SUCCESS] binary-size{build.target="aarch64-unknown-linux-gnu", platform.os="linux", platform.arch="aarch64", unit="byte"} 3.39 MiB => 3.39 MiB
[SUCCESS] binary-size{build.target="x86_64-apple-darwin", platform.os="macos", platform.arch="x86_64", unit="byte"} 3.18 MiB => 3.18 MiB Δ +8.06 kiB (+0.25 %)
[SUCCESS] binary-size{build.target="aarch64-apple-darwin", platform.os="macos", platform.arch="aarch64", unit="byte"} 3.18 MiB => 3.18 MiB Δ +8.05 kiB (+0.25 %)
[SUCCESS] binary-size{build.target="x86_64-pc-windows-msvc", platform.os="windows", platform.arch="x86_64", unit="byte"} 4.00 MiB => 4.01 MiB Δ +16.50 kiB (+0.40 %)
[SUCCESS] binary-size{build.target="aarch64-pc-windows-msvc", platform.os="windows", platform.arch="aarch64", unit="byte"} 3.56 MiB => 3.57 MiB Δ +12.50 kiB (+0.34 %)
[SKIP] coverage.functions.count 396.00 => 396.00
[SKIP] coverage.functions.hit 295.00 => 295.00
[SUCCESS] coverage.functions.percentage 0.74 => 0.74
[SKIP] coverage.lines.count 3430.00 => 3430.00
[SKIP] coverage.lines.hit 2919.00 => 2919.00
[SUCCESS] coverage.lines.percentage 0.85 => 0.85

We should get something like

	Metric	Previous branch	Current branch	Change
✅	binary-size{build.target="x86_64-unknown-linux-gnu", platform.os="linux", platform.arch="x86_64", unit="byte"}	3.71 MiB	3.71 MiB
✅	binary-size{build.target="aarch64-unknown-linux-gnu", platform.os="linux", platform.arch="aarch64", unit="byte"}	3.39 MiB	3.39 MiB
✅	binary-size{build.target="x86_64-apple-darwin", platform.os="macos", platform.arch="x86_64", unit="byte"}	3.18 MiB	3.18 MiB	+8.06 kiB (+0.25 %)
✅	binary-size{build.target="x86_64-apple-darwin", platform.os="macos", platform.arch="aarch64", unit="byte"}	3.18 MiB	3.18 MiB	+8.05 kiB (+0.25 %)
✅	binary-size{build.target="x86_64-pc-windows-msvc", platform.os="windows", platform.arch="x86_64", unit="byte"}	4.00 MiB	4.01 MiB	+16.50 kiB (+0.40 %)
✅	binary-size{build.target="aarch64-pc-windows-msvc", platform.os="windows", platform.arch="aarch64", unit="byte"}	3.56 MiB	3.57 MiB	+12.50 kiB (+0.34 %)
⏭️	coverage.functions.count	396.00	396.00
⏭️	coverage.functions.hit	295.00	295.00
✅	coverage.functions.percentage	0.74	0.74
⏭️	coverage.lines.count	3430.00	3430.00
⏭️	coverage.lines.hit	2919.00	2919.00
✅	coverage.lines.percentage	0.85	0.85