Print cache stats with --times

[majocha]

Description

When compiling with --times option, print also collected cache metrics in tabular form.
Currently it just prints hit ratio and some raw event counts.

    ...
    |>Writing Image                      | 32.0912|  0.0011|   2444|      0|      0|      0|    510|     50|
    |>Finalize PDB                       | 32.0931|  0.0000|   2444|      0|      0|      0|    509|     50|
    |>Signing Image                      | 32.0949|  0.0000|   2444|      0|      0|      0|    509|     50|
    |>Generate PDB Info                  | 32.0962|  0.0000|   2444|      0|      0|      0|    509|     50|
    |Write .NET Binary                   | 32.0976|  3.8032|   2444|      5|      4|      2|    509|     50|
    --------------------------------------------------------------------------------------------------------
    -------------------------------------------------------------------------------------------------------------
    | Cache name           | hit-ratio |     adds |  updates |     hits |   misses | evictions | eviction-fails |
    |----------------------|-----------|----------|----------|----------|----------|-----------|----------------|
    | typeSubsumptionCache |    69.28% |   129286 |        0 |   291513 |   129286 |         0 |              0 |
    -------------------------------------------------------------------------------------------------------------

Also reenable debug display showing the metrics for individual instances when debugging.

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cc @dotnet/fsharp-team-msft