Separate compilation and linker phases (#376)

Separate between compilation and linker phases to allow deploy time
linking and back-porting era compiler changes to fix #91. Unlinked
contract binaries (caused by missing libraries or missing factory
dependencies in turn) are emitted as raw ELF object.

Few drive by fixes:
- #98
- A compiler panic on missing libraries definitions.
- Fixes some incosistent type forwarding in JSON output (empty string
vs. null object).
- Remove the unused fallback for size optimization setting.
- Remove the broken `--lvm-ir`  mode.
- CI workflow fixes.

---------

Signed-off-by: Cyrill Leutwiler <bigcyrill@hotmail.com>
Signed-off-by: xermicus <bigcyrill@hotmail.com>
Signed-off-by: xermicus <cyrill@parity.io>

crates/solc-json-interface/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "revive-solc-json-interface"
-version = "0.2.0"
+version = "0.3.0"
 authors.workspace = true
 license.workspace = true
 edition.workspace = true
@@ -17,6 +17,7 @@ resolc = [] # The resolc binary adds a bunch of custom fields to the format
 revive-common = { workspace = true }
 
 anyhow = { workspace = true }
+hex = { workspace = true }
 rayon = { workspace = true, optional = true }
 semver = { workspace = true }
 serde = { workspace = true }