[Docs][MATLAB] Update MATLAB `README.md` to mention support for new MATLAB APIs (e.g. `RecordBatch`, `Field`, `Schema`, etc.)

[kevingurney]

Describe the enhancement requested

Over the last few months, a number of new user-facing APIs have been added or changed in the MATLAB Interface.

Examples:

Construction Functions

• arrow.array
• arrow.field
• arrow.schema
• arrow.recordbatch
• arrow.boolean, arrow.string, arrow.timestamp, etc. (type construction functions)

Classes

• arrow.type.Field
• arrow.tabular.Schema
• arrow.tabular.RecordBatch
• arrow.array.StringArray
• arrow.array.TimestampArray

Indexing Methods

• arrow.tabular.Schema.field(i)
• arrow.tabular.RecordBatch.column(i)

Static Construction Methods

• arrow.tabular.RecordBatch.fromArrays(a1, ..., aN)
• arrow.array.StringArray.fromMATLAB(a)

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We should update the README.md for the MATLAB Interface to reflect these changes.

Component(s)

MATLAB

[kevingurney]

Added label Component: Documentation since this is related to the MATLAB README.md, which is currently the main source of documentation for the MATLAB Interface.