Provide init function for initializing library (#11)

Author: quinnj

src/LibAwsCommon.jl

@@ -43,4 +43,9 @@ for name in names(@__MODULE__; all=true)
     @eval export $name
 end
 
+function init(allocator=aws_default_allocator())
+    aws_common_library_init(allocator)
+    return
+end
+
 end

test/runtests.jl

@@ -7,6 +7,7 @@ using Test, Aqua, LibAwsCommon
     end
     @testset "basic usage to test the library loads" begin
         allocator = aws_default_allocator()
+        LibAwsCommon.init(allocator)
         logpath = joinpath(mktempdir(), "log.txt")
         GC.@preserve logpath begin
             logger = Ref(aws_logger(C_NULL, C_NULL, C_NULL))