Support strict settings option in timemory + expanded config syntax

[jrmadsen]

• timemory settings updates
  • strict config option
  • improved variable support
    • $env: lvalues
    • support for ${VARIABLE} syntax
    • support for variable expansion in substring
  • chained config files

Example configuration file using new syntax

# config variable
$USE                            = ON
$COMP                           = $env:OMNI_COMPONENTS

# exports as default environment variable (new)
$env:OMNI_SAMP                  = ON
$env:OMNI_EXTRA                 = ON
$env:OMNI_ROCM                  = OFF

# now supports ${USE} instead of just $USE (new)
OMNITRACE_USE_PERFETTO          = ${USE}
OMNITRACE_USE_TIMEMORY          = ${USE}

OMNITRACE_USE_SAMPLING          = $env:OMNI_SAMP
OMNITRACE_USE_THREAD_SAMPLING   = $env:OMNI_SAMP

OMNITRACE_USE_KOKKOSP           = $env:OMNI_EXTRA
OMNITRACE_USE_OMPT              = $env:OMNI_EXTRA
OMNITRACE_CRITICAL_TRACE        = $env:OMNI_EXTRA

OMNITRACE_USE_ROCTRACER         = $env:OMNI_ROCM
OMNITRACE_USE_ROCM_SMI          = $env:OMNI_ROCM

# variables are expanded in substring after "=" (new)
OMNITRACE_TIMEMORY_COMPONENTS   = wall_clock ${COMP}