This reduces the complexity of the ParseArgs function by extracting
different parts of it into separate helpers. This makes the code
easier to read and understand and also makes it smaller.

Before:
1a080c0      14863 T github.com/aquasecurity/tracee/pkg/events.ParseArgs

After:
1a0cee0      11632 T github.com/aquasecurity/tracee/pkg/events.ParseArgs

It's a reduction of 21.73% in the size of the function what should also
improve cache locality and performance.

The benchmark tests also show a significant improvement in performance,
with a reduction of 6.4% in the time it takes to parse the arguments.

Running tool: /home/gg/.goenv/versions/1.22.4/bin/go test -benchmem
-run=^$ -tags ebpf -bench ^(BenchmarkParseArgsPrev|BenchmarkParseArgs)$
github.com/aquasecurity/tracee/pkg/events -benchtime=20000000x -race

goos: linux
goarch: amd64
pkg: github.com/aquasecurity/tracee/pkg/events
cpu: AMD Ryzen 9 7950X 16-Core Processor
=== RUN   BenchmarkParseArgsPrev
BenchmarkParseArgsPrev
BenchmarkParseArgsPrev-32               20000000              2002 ns/op               0 B/op          0 allocs/op
=== RUN   BenchmarkParseArgs
BenchmarkParseArgs
BenchmarkParseArgs-32                   20000000              1873 ns/op               0 B/op          0 allocs/op

Bypass the lock contention accessing the read-only map directly.