Allow fuzzy string comparisons in $filter expr

Filter allows comparing certain strings as numeric greater than or less
than operators. The most obvious example of this is something like

\$filter=C

Allow fuzzy string comparisons in $filter expr

Filter allows comparing certain strings as numeric greater than or less
than operators. The most obvious example of this is something like

\$filter=Created gt <timestamp>

Because internally timestamps are treated as strings, this requires
including and parsing out the timestamps again, which we have utilities
for.

In addition, "fuzzy" string comparisons, like

GPU_2 gt GPU_1

Should also be supported.

Tested: Unit tests pass

Change-Id: I39fc543921ed8cc93664d9cf297dad8ee902b68f
Signed-off-by: Ed Tanous <ed@tanous.net>

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Add filter parameter support

$filter is a parameter documented in the Redfish specification, section
7.3.4. It defines a mechanism for filtering arbitrary collections of
parameters based on a set o

Add filter parameter support

$filter is a parameter documented in the Redfish specification, section
7.3.4. It defines a mechanism for filtering arbitrary collections of
parameters based on a set of arbitrary language expressions.

From the specification, it supports the following language operators:

() Precedence grouping operator.
(Status/State eq 'Enabled' and Status/Health eq 'OK')
or SystemType eq 'Physical'

and Logical and operator.
ProcessorSummary/Count eq 2 and MemorySummary/TotalSystemMemoryGiB gt 64

eq Equal comparison operator.
ProcessorSummary/Count eq 2

ge Greater than or equal to comparison operator.
ProcessorSummary/Count ge 2

gt Great than comparison operator.
ProcessorSummary/Count gt 2

le Less than or equal to comparison operator
MemorySummary/TotalSystemMemoryGiB le 64

lt Less than comparison operator.
MemorySummary/TotalSystemMemoryGiB lt 64

ne Not equal comparison operator.
SystemType ne 'Physical'

not Logical negation operator.
not (ProcessorSummary/Count eq 2)

or Logical or operator.
ProcessorSummary/Count eq 2 or ProcessorSummary/Count eq 4

Support for these operators have been added in previous commits. This
commit enables them behind the insecure-enable-redfish-query meson
option. This is an arbitrary language, so the likelihood there's some
improper implementation in the patch is high. This gives folks the
ability to test it.

Tested:
Lots of unit tests included in this patch.

Functionally tested the basic operators:
```
GET /redfish/v1/Managers/bmc/LogServices/Journal/Entries?\$filter=EntryType+eq+'Oem'
GET /redfish/v1/Managers/bmc/LogServices/Journal/Entries?\$filter=EntryType+ne+'Oem'
```

Function as expected, producing multiple results or no results
respectively.

GET /redfish/v1 reports "FilterQuery": true

Redfish service validator passes.

Change-Id: Id568acc5dcfce868af12da5ee16c4f0caae8060a
Signed-off-by: Ed Tanous <ed@tanous.net>

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